An element crystallise in F.C.C whose crystal density 5.2 gm/cm^3 and limiting length is 300 pm.Calculate number of atoms present in 105.65 gm of an element.
An element crystallise in F.C.C whose crystal density 5.2 gm/cm^3 and limiting length is 300 pm.Calculate number of atoms present in 105.65 gm of an element.
Gold Au(197) crystallises in F.C.C whose crystal density is 19.3 gm/cm^3 .Calculate atomic radius of gold atom.
Gold Au(197) crystallises in F.C.C whose crystal density is 19.3 gm/cm^3 .Calculate atomic radius of gold atom.
Li has a bcc structure. its is 530 kg and its atomic mass is 6.94 g/mol . Calculate length of a unit cell of lithium meta
Li has a bcc structure. its 
is 530 kg and its atomic mass is 6.94 g/mol . Calculate length of a unit cell of lithium meta
SMALLEST ELEMENT IN PERIODIC TABLE
Which is the smallest element in the periodic table and why ???
When 20 g of napthanoic acid (C11H8O2) is dissolved in 50 g of benzene (K, = 1.72 K kg/mol) a freezing pointdepression of 2 K is observed. The van't Hoff factor (i) is
When 20 g of napthanoic acid (C11H8O2) is dissolved in 50 g of benzene (K, = 1.72 K kg/mol) a freezing point
depression of 2 K is observed. The van't Hoff factor (i) is
A 0.2 molal aqueous solution of weak acid HX is 20% ionized. The freezing point of solution is(Kf=1.86)
A 0.2 molal aqueous solution of weak acid HX is 20% ionized. The freezing point of solution is(Kf=1.86)
The value of observed and calculated molecular weights of silver nitrate are 92.64 and 170 respectively. The degree of dissociation of silver nitrate is
The value of observed and calculated molecular weights of silver nitrate are 92.64 and 170 respectively. The degree of dissociation of silver nitrate is
If a solute undergoes dimerisation and trimerisation, the minimum values of the van't Hoff factors are
If a solute undergoes dimerisation and trimerisation, the minimum values of the van't Hoff factors are
2 millimolar solution of sodium ferrocyanide is 60% dissociated at 27°C. Osmotic pressure of the solution is
2 millimolar solution of sodium ferrocyanide is 60% dissociated at 27°C. Osmotic pressure of the solution is
A water sample contains 9.5% MgCl2 and 11.7% NaCl (by weight). Assuming 80% ionisation of each salt.Boiling point of water will be approximately (Kb= 0.52)
A water sample contains 9.5% MgCl2 and 11.7% NaCl (by weight). Assuming 80% ionisation of each salt.Boiling point of water will be approximately (Kb= 0.52)
A complex is written as M(en)y.xBr. Its 0.05 molar solution shows 2.46 atm osmotic pressure at 27°C.Assuming 100% ionisation and coordination number of metal (III) is six, complex may be
A complex is written as M(en)y.xBr. Its 0.05 molar solution shows 2.46 atm osmotic pressure at 27°C.Assuming 100% ionisation and coordination number of metal (III) is six, complex may be
20 g of non-electrolyte, non-volatile solute (CxH2xOx), when dissolved in 100 gm water at 100°C, lowers the vapour pressure of solution by 1/100 th of the vapour pressure of pure water at this temperature. What is formula of the compound?
20 g of non-electrolyte, non-volatile solute (CxH2xOx), when dissolved in 100 gm water at 100°C, lowers the vapour pressure of solution by 1/100 th of the vapour pressure of pure water at this temperature. What is formula of the compound?
Degree of dissociation of three binary electrolytes AB, CD and EF are 60%, 20% and 100% in the solution having same mole fraction of water. Ratio of lowering in vapour pressure of their solution is
Degree of dissociation of three binary electrolytes AB, CD and EF are 60%, 20% and 100% in the solution having same mole fraction of water. Ratio of lowering in vapour pressure of their solution is
Osmotic pressure of a blood sample is 4.92 atm at 27°C. Which of the following is not isotonic with bloodsample?
Osmotic pressure of a blood sample is 4.92 atm at 27°C. Which of the following is not isotonic with blood
sample?
0.067 molar aqueous solution of a binary electrolyte A+B– shows 2.46 atm osmotic pressure at 27°C. What fraction of A+B– remains unionised?
0.067 molar aqueous solution of a binary electrolyte A+B– shows 2.46 atm osmotic pressure at 27°C. What fraction of A+B– remains unionised?
Out of X-rays, infrared rays, visible rays and microwaves, the largest frequency is of
Out of X-rays, infrared rays, visible rays and microwaves, the largest frequency is of
How many electrons with / = 2 are there in an atom having atomic number 54?
How many electrons with / = 2 are there in an atom having atomic number 54?
The maximum number of electrons possible in subshell is equal to
The maximum number of electrons possible in subshell is equal to
The potential energy of an electron in hydrogen atom is -3.02 eV, its kinetic energy will be
The potential energy of an electron in hydrogen atom is -3.02 eV, its kinetic energy will be
In the emission line spectra of hydrogen atom, how many lines can be accounted for all possible electronic transitions from 5th energy level within the atom?
In the emission line spectra of hydrogen atom, how many lines can be accounted for all possible electronic transitions from 5th energy level within the atom?
Which set of quantum numbers is not consistent with theory?
Which set of quantum numbers is not consistent with theory?
The total number of electrons in a 4d subshell are
The total number of electrons in a 4d subshell are
The correct set of quantum numbers for the unpaired electron of chlorine atom is
The correct set of quantum numbers for the unpaired electron of chlorine atom is
The electron identified by quantum numbers n and / (i) n=4,/=1 (ii) n=4,/=0, (iii) n= 3,/=0 (v) n=3,/= 1 Can be placed in order of increasing energy
The electron identified by quantum numbers n and /
(i) n=4,/=1 (ii) n=4,/=0, (iii) n= 3,/=0 (v) n=3,/= 1
Can be placed in order of increasing energy
Which of the following represent(s) the correct set of four quantum numbers of a 4d electron?
Which of the following represent(s) the correct set of four quantum numbers of a 4d electron?
How many 3d electrons can have spin quantum number -1/2 ?
How many 3d electrons can have spin quantum number -1/2 ?
The total number of orbitals in a shell with principal quantum number n is
The total number of orbitals in a shell with principal quantum number n is
The momentum of a particle which has a de Broglie wavelength of 0.1 nm is (h = 6.6 × 10^-34 Js)
The momentum of a particle which has a de Broglie wavelength of 0.1 nm is (h = 6.6 × 10^-34 Js)
Which of the following equation was suggested by de Broglie?
Which of the following equation was suggested by de Broglie?
Which of the following has the same number of s-electrons as the d-electrons in Fe2+?
Which of the following has the same number of s-electrons as the d-electrons in Fe2+?
The radius of 5th Bohr orbit in hydrogen atom is
The radius of 5th Bohr orbit in hydrogen atom is
Which of the following ion has the maximum magnetic moment?
Which of the following ion has the maximum magnetic moment?
Which of the following layering pattern will have a void fraction of 0.26?
Which of the following layering pattern will have a void fraction of 0.26?
A binary solid has atoms B constitutes fcc lattice and atoms A occupies 25% of tetrahedral holes. The formula of solid is
A binary solid has atoms B constitutes fcc lattice and atoms A occupies 25% of tetrahedral holes. The formula of solid is
If a cation leaves a site in solid lattice, and is located at an interstitial position. The lattice defect is
If a cation leaves a site in solid lattice, and is located at an interstitial position. The lattice defect is
The ratio of number of closed packed atoms to the number of tetrahedral holes in cubic closed packing is
The ratio of number of closed packed atoms to the number of tetrahedral holes in cubic closed packing is
In Zinc blende structure, Zn+2 ions are present in alternate tetrahedral voids and S–2 in ccp. The coordination number of Zn+2 and S–2 are respectively
In Zinc blende structure, Zn+2 ions are present in alternate tetrahedral voids and S–2 in ccp. The coordination number of Zn+2 and S–2 are respectively
An element (At. mass = 50 g/mol) having fcc structure has unit cell edge length 400 pm. The density of element is
An element (At. mass = 50 g/mol) having fcc structure has unit cell edge length 400 pm. The density of element is
In a crystalline solid, anion B are arranged in cubic close packing and cation A are equally distributed between octahedral and tetrahedral voids. If all the octahedral voids are occupied, the formula for the solid is
In a crystalline solid, anion B are arranged in cubic close packing and cation A are equally distributed between octahedral and tetrahedral voids. If all the octahedral voids are occupied, the formula for the solid is
A tetrahedral void in fcc is formed by atoms at
A tetrahedral void in fcc is formed by atoms at
Density of crystal decreases in
Density of crystal decreases in
Zinc sulphide exists in two different structural forms as zinc blende (FCC) and Wurtzite (HCP). What will be the coordination number of cation and anion in both the structures?
Zinc sulphide exists in two different structural forms as zinc blende (FCC) and Wurtzite (HCP). What will be the coordination number of cation and anion in both the structures?
F-centers are related to
F-centers are related to
Quartz on strong heating followed by rapid cooling gives glass which is an amorphous solid because
Quartz on strong heating followed by rapid cooling gives glass which is an amorphous solid because
Lithium crystallizes in a body centred cubic lattice, how many next nearest neighbours does each Li has?
Lithium crystallizes in a body centred cubic lattice, how many next nearest neighbours does each Li has?
Water gas is a mixture of
Water gas is a mixture of
An orange coloured solution of K2Cr2O7 acidified with H2SO4 and treated with a substance X gives a blue coloured solution of CrO5. The substance X is
An orange coloured solution of K2Cr2O7 acidified with H2SO4 and treated with a substance X gives a blue coloured solution of CrO5. The substance X is
When 1 mole of PbS reacts completely with
When 1 mole of PbS reacts completely with 
The term hydride gap refers to which region of periodic table?
The term hydride gap refers to which region of periodic table?
2-ethyl anthraquinol when oxidised in air produces
2-ethyl anthraquinol when oxidised in air produces
In alkaline medium, which elements can produce hydrogen?
In alkaline medium, which elements can produce hydrogen?
The boiling point of water is exceptionally high due to
The boiling point of water is exceptionally high due to
The volume strength of 3.57 M solution of hydrogen peroxide is
The volume strength of 3.57 M solution of hydrogen peroxide is
H2O2 can be obtained when following reacts with H2SO4 except with
H2O2 can be obtained when following reacts with H2SO4 except with
For a first order reaction A -> P, the temperature (T) dependent rate constant (k) was found to follow the equation log k = – (2000) 1/T + 6.0. The pre-exponential factor A and the activation energy Ea, respectively, are
For a first order reaction A -> P, the temperature (T) dependent rate constant (k) was found to follow the equation
log k = – (2000) 1/T + 6.0. The pre-exponential factor A and the activation energy Ea, respectively, are
The half life for decay of a radio active isotope is 14 hrs. Determine the fraction of radio isotope remaining undecayed after 30 hours
The half life for decay of a radio active isotope is 14 hrs. Determine the fraction of radio isotope remaining undecayed after 30 hours
A positron is emitted from . The ratio of the atomic mass and atomic number of the resulting nuclide is
A positron is emitted from 
. The ratio of the atomic mass and atomic number of the resulting nuclide is
Consider a reaction aG + bH -> Products. When concentration of both the reactants G and H is doubled, the rate increases by eight times. However, when concentration of G is doubled keeping the concentration of H fixed, the rate is doubled. The overall order of the reaction is
Consider a reaction aG + bH -> Products. When concentration of both the reactants G and H is doubled, the rate increases by eight times. However, when concentration of G is doubled keeping the concentration of H fixed, the rate is doubled. The overall order of the reaction is
For the elementary reaction M -> N, the rate of disappearance of M increases by a factor of 8 upon doubling the concentration of M. The order of the reaction with respect to M is
For the elementary reaction M -> N, the rate of disappearance of M increases by a factor of 8 upon doubling the concentration of M. The order of the reaction with respect to M is
The concentration of a reactant in a solution falls from 0.2 M to 0.1 M in 2 hours and to 0.05 M in 4 hours. The order of reaction is
The concentration of a reactant in a solution falls from 0.2 M to 0.1 M in 2 hours and to 0.05 M in 4 hours. The order of reaction is
Half life of a chemical reaction at a particular concentration is 50 minutes. When the concentration of the reactant is doubled, the half life becomes 100 minutes, then the order of reaction is
Half life of a chemical reaction at a particular concentration is 50 minutes. When the concentration of the reactant is doubled, the half life becomes 100 minutes, then the order of reaction is
The temperature coefficient of most of the reactions lie between
The temperature coefficient of most of the reactions lie between
The radiation from a naturally occurring radioactive substance as seen after deflection by a magnetic field in one direction are
The radiation from a naturally occurring radioactive substance as seen after deflection by a magnetic field in one direction are
A decapeptide (Mol. Wt. 796) on complete hydrolysis gives glycine (Mol. Wt. 75), alanine and phenylalanine. Glycine contributes 47.0% to the total weight of the hydrolysed products. The number of glycine units present in the decapeptide is?
A decapeptide (Mol. Wt. 796) on complete hydrolysis gives glycine (Mol. Wt. 75), alanine and phenylalanine. Glycine contributes 47.0% to the total weight of the hydrolysed products. The number of glycine units present in the decapeptide is?
Net charge available on a basic amino acid at pH = 1 would be?
Net charge available on a basic amino acid at pH = 1 would be?
What is the total number of acidic amino acids found in human proteins?
What is the total number of acidic amino acids found in human proteins?
Which form of D-Glucose is more stable?
Which form of D-Glucose is more stable?
1.alpha - D - Glucose
2.Beta - D - Glucose
3. Open Chain
4. All forms are equally stable
Ring structure of glucose is due to formation of hemiacetal and ring formation between
Ring structure of glucose is due to formation of hemiacetal and ring formation between
Acid hydrolysis of sucrose causes
Acid hydrolysis of sucrose causes
Peptides are composed of amino acids joined by amide bonds. which of the following statements is not correct?
Peptides are composed of amino acids joined by amide bonds. which of the following statements is not correct?
A tripeptide is composed equally of L-valine, L-tyrosine and L-alanine (one molecule of each). How many isomeric tripeptides of this kind may exist?
A tripeptide is composed equally of L-valine, L-tyrosine and L-alanine (one molecule of each). How many isomeric tripeptides of this kind may exist?
-helical structure of protein is stabilized by
-helical structure of protein is stabilized by
When protein is subjected to denaturation
When protein is subjected to denaturation
Fructose reduces Tollen’s reagent due to
Fructose reduces Tollen’s reagent due to
In alkaline solution D-glucose, D-mannose and D-fructose are in equilibrium. This reaction is known as
In alkaline solution D-glucose, D-mannose and D-fructose are in equilibrium. This reaction is known as
The total number of isomeric alkenes possible by C4H8 are ____
The total number of isomeric alkenes possible by 
are ____
The total number of alkenes possible by dehydrobromination of 3-bromo-3-cyclopentylhexane using alcoholic KOH is
The total number of alkenes possible by dehydrobromination of 3-bromo-3-cyclopentylhexane using alcoholic KOH is
A hydrocarbon (A) adds one mole of hydrogen in the presence of platinum gives hexane. When (A) was oxidised with KMnO4 it gave a single carboxylic acid, containing three carbon atoms. Give the structure and name of (A)
A hydrocarbon (A) adds one mole of hydrogen in the presence of platinum gives hexane. When (A) was oxidised with KMnO4 it gave a single carboxylic acid, containing three carbon atoms. Give the structure and name of (A)
896 ml vapour of a hydrocarbon ‘A’ having carbon 87.80% and hydrogen 12.19% weighs 3.28 g at STP. Hydrogenation of ‘A’ gives 2-methyl pentane. Also the hydration of hydrocarbon ‘A’ gives compound ‘B’. Compound ‘B’ gives yellow precipitate with sodium hypoiodite. Find the structure of A and give the reactions involved.
896 ml vapour of a hydrocarbon ‘A’ having carbon 87.80% and hydrogen 12.19% weighs 3.28 g at STP. Hydrogenation of ‘A’ gives 2-methyl pentane. Also the hydration of hydrocarbon ‘A’ gives compound ‘B’. Compound ‘B’ gives yellow precipitate with sodium hypoiodite. Find the structure of A and give the reactions involved.
The minimum number of carbon atoms in alkane molecule to show chain isomerism is
The minimum number of carbon atoms in alkane molecule to show chain isomerism is
Alkanes can be iodinated in the presence of
Alkanes can be iodinated in the presence of
In the complete combustion of hydrocarbon the number of oxygen molecules required per mole of hydrocarbon is
In the complete combustion of hydrocarbon 
the number of oxygen molecules required per mole of hydrocarbon is
Highest boiling point is expected for
Highest boiling point is expected for
2.8 g of pure alkene containing only one double bond per molecule, reacts completely with 8 g of bromine in an inert solvent. The molecular formula of alkene is
2.8 g of pure alkene containing only one double bond per molecule, reacts completely with 8 g of bromine in an inert solvent. The molecular formula of alkene is
Among cellulose, poly(vinyl chloride), nylon and natural rubber, the polymer in which the intermolecular force of attraction is weakest is?
Among cellulose, poly(vinyl chloride), nylon and natural rubber, the polymer in which the intermolecular force of attraction is weakest is?
1.Nylon.
2.Poly(vinyl chloride)
3.Cellulose.
4.Natural Rubber
How will you synthesize Nylon 6 and Nylon 66?
How will you synthesize Nylon 6 and Nylon 66?
Cellulose acetate is a?
Cellulose acetate is a?
The half life of a first order reaction is 10 min. If initial amount is 0.08 mol L-1 and concentration at some instant is 0.01 mol L-1. What is the time elapsed ?
The half life of a first order reaction is 10 min. If initial amount is 0.08 mol L-1 and concentration at some instant is 0.01 mol L-1. What is the time elapsed ?
The correct order of boiling points of 2, 2-dimethylpropane, 2-methylbutane and n-pentane is
The correct order of boiling points of 2, 2-dimethylpropane, 2-methylbutane and n-pentane is
How many P–H and O–H bonds respectively, are present in molecule?
How many P–H and O–H bonds respectively, are present in 
molecule?
Though the five d-orbitals are degenerate, the first four d-orbitals are similar to each other in shape whereas the fifth d-orbital is different from others. What is the designation of the fifth orbital?
Though the five d-orbitals are degenerate, the first four d-orbitals are similar to each other in shape whereas the fifth d-orbital is different from others. What is the designation of the fifth orbital?
The resistance of 0.01 N solution of an electrolyte was found to be 220 ohm at 298 K using a conductivity cell with a cell constant of 0.88cm–1. The value of equivalent conductance of solution is –
The resistance of 0.01 N solution of an electrolyte was found to be 220 ohm at 298 K using a conductivity cell with a cell constant of 0.88cm–1. The value of equivalent conductance of solution is –
The temperature of an ideal gas is reduced from 927°C to 27°C. the r.m.s. velocity of the molecules becomes.
The temperature of an ideal gas is reduced from 927°C to 27°C. the r.m.s. velocity of the molecules becomes.
Which is not true for beryllium ?
Which is not true for beryllium ?
Which of the following pairs show reverse properties on moving along a period from left to right and from up to down in a group :
Which of the following pairs show reverse properties on moving along a period from left to right and from up to down in a group :
A fire of lithium, sodium and potassium can be extinguished by
A fire of lithium, sodium and potassium can be extinguished by
An ‘fcc’ in a unit cell of aluminium contains the equivalent of how many atoms ?
An ‘fcc’ in a unit cell of aluminium contains the equivalent of how many atoms ?
Moissan boron is
Moissan boron is
If the solutions of NaCl and NaNO3 are mixed in one beaker and the temperature adjusted to 383° K, the contents of the beaker will most likely:
If the solutions of NaCl and NaNO3 are mixed in one beaker and the temperature adjusted to 383° K, the contents of the beaker will most likely:
Which one of the alkali metals, forms only, the normal oxide, M2O on heating in air ?
Which one of the alkali metals, forms only, the normal oxide, M2O on heating in air ?
A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the solution, a white precipitate is obtained which does not dissolve in dil. HNO3. The anion could be
A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the solution, a white precipitate is obtained which does not dissolve in dil. HNO3. The anion could be
Given the molecular formula of the hexa-coordinated complexes (i) CoCl3.6NH3, (ii) CoCl3.5NH3, (iii) CoCl3.4NH3 If the number of co-ordinated NH3 molecules in (i), (ii) and (iii) respectively are 6, 5, 4, the primary valencies in (i), (ii) and (iii) are :
Given the molecular formula of the hexa-coordinated complexes (i) CoCl3.6NH3, (ii) CoCl3.5NH3, (iii) CoCl3.4NH3 If the number of co-ordinated NH3 molecules in (i), (ii) and (iii) respectively are 6, 5, 4, the primary valencies in (i), (ii) and (iii) are :
The temperature of an ideal gas is reduced from 927°C to 27°C. the r.m.s. velocity of the molecules becomes.
The temperature of an ideal gas is reduced from 927°C to 27°C. the r.m.s. velocity of the molecules becomes.
Which is not true for beryllium ?
Which is not true for beryllium ?
Which of the following pairs show reverse properties on moving along a period from left to right and from up to down in a group :
Which of the following pairs show reverse properties on moving along a period from left to right and from up to down in a group :
A fire of lithium, sodium and potassium can be extinguished by
A fire of lithium, sodium and potassium can be extinguished by
An ‘fcc’ in a unit cell of aluminium contains the equivalent of how many atoms ?
An ‘fcc’ in a unit cell of aluminium contains the equivalent of how many atoms ?
Moissan boron is
Moissan boron is
If the solutions of NaCl and NaNO3 are mixed in one beaker and the temperature adjusted to 383° K, the contents of the beaker will most likely:
If the solutions of NaCl and NaNO3 are mixed in one beaker and the temperature adjusted to 383° K, the contents of the beaker will most likely:
Which one of the alkali metals, forms only, the normal oxide, M2O on heating in air ?
Which one of the alkali metals, forms only, the normal oxide, M2O on heating in air ?
A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the solution, a white precipitate is obtained which does not dissolve in dil. HNO3. The anion could be
A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the solution, a white precipitate is obtained which does not dissolve in dil. HNO3. The anion could be
Given the molecular formula of the hexa-coordinated complexes (i) CoCl3.6NH3, (ii) CoCl3.5NH3, (iii) CoCl3.4NH3 If the number of co-ordinated NH3 molecules in (i), (ii) and (iii) respectively are 6, 5, 4, the primary valencies in (i), (ii) and (iii) are :
Given the molecular formula of the hexa-coordinated complexes (i) CoCl3.6NH3, (ii) CoCl3.5NH3, (iii) CoCl3.4NH3 If the number of co-ordinated NH3 molecules in (i), (ii) and (iii) respectively are 6, 5, 4, the primary valencies in (i), (ii) and (iii) are :
Which one of the following types of drugs reduces fever?
Which one of the following types of drugs reduces fever?
The smog is essentially caused by the presence of
The smog is essentially caused by the presence of
The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is
The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is
When primary amine reacts with chloroform in 5. ethanolic KOH then the product is
When primary amine reacts with chloroform in 5. ethanolic KOH then the product is
Ethyl isocyanide on hydrolysis in acidic medium generates
Ethyl isocyanide on hydrolysis in acidic medium generates
The two functional groups present in a typical 29. 30. carbohydrate are
The two functional groups present in a typical 29. 30. carbohydrate are?
Copper crystallizes in fcc with a unit cell length of 361 pm. What is the radius of copper atom ?
Copper crystallizes in fcc with a unit cell length of 361 pm. What is the radius of copper atom ?
Two liquids X and Y form an ideal solution. At 300 K, vapour pressure of the solution containing 1mol of X and 3 mol of Y is 550 mm Hg.Atthesame temperature, if 1 mol of Y is further added to this solution, vapour pressure of the solution increases by 10 mm Hg. Vapour pressure (in mm Hg) of X and Y in their pure states will be, respectively
Two liquids X and Y form an ideal solution. At 300 K, vapour pressure of the solution containing 1mol of X and 3 mol of Y is 550 mm Hg.Atthesame temperature, if 1 mol of Y is further added to this solution, vapour pressure of the solution increases by 10 mm Hg. Vapour pressure (in mm Hg) of X and Y in their pure states will be, respectively
If half life of a substance is 5 yrs, then the total amount of substance left after 15 years, when initial amount is 64 grams is
If half life of a substance is 5 yrs, then the total amount of substance left after 15 years, when initial amount is 64 grams is
(beta) particle is emitted in radioactivity by
(beta) particle is emitted in radioactivity by
The radionucleide undergoes two successive followed by one . The atomic number and the mass number respectively of the resulting radionucleide are
The radionucleide 
undergoes two successive 
followed by one 
. The atomic number and the mass number respectively of the resulting radionucleide are
The half life of a radioactive isotope is three hours. If the initial mass of the iosotope were 256 g, the mass of it remaining undecayed after 18 hours would be
The half life of a radioactive isotope is three hours. If the initial mass of the iosotope were 256 g, the mass of it remaining undecayed after 18 hours would be
The halflife of a radioisotope is four hours. If the initial mass of the isotope was 200 g, the mass remaining after 24 hours undecayed is
The halflife of a radioisotope is four hours. If the initial mass of the isotope was 200 g, the mass remaining after 24 hours undecayed is
Hydrogen bomb is based on the principle of
Hydrogen bomb is based on the principle of
A photon of hard gamma radiation knocks a proton out of nucleus to form
A photon of hard gamma radiation knocks a proton out of 
nucleus to form
In the transformation of , if one emission is an alpha particle, what should be the other emission(s)?
In the transformation of 
, if one emission is an alpha particle, what should be the other emission(s)?
A radioactive element gets spilled over the floor of a room. Its halflife period is 30 days. If the initial velocity is ten times the permissible value, after how many days will it be safe to enter the room?
A radioactive element gets spilled over the floor of a room. Its halflife period is 30 days. If the initial velocity is ten times the permissible value, after how many days will it be safe to enter the room?
Which of the following nuclear reactions will generate an isotope?
Which of the following nuclear reactions will generate an isotope?
RNA is different from DNA because RNA contains
RNA is different from DNA because RNA contains
The functional group, which is found in amino acid is
The functional group, which is found in amino acid is
Complete hydrolysis of cellulose gives
Complete hydrolysis of cellulose gives
The reason for double helical structure of DNA is operation of
The reason for double helical structure of DNA is operation of
Identify the correct statement regarding enzymes
Identify the correct statement regarding enzymes
Which base is present in RNA but not in DNA?
Which base is present in RNA but not in DNA?
Insulin production and its action in human body are responsible for the level of diabetes. This compound belongs to which of the following categories?
Insulin production and its action in human body are responsible for the level of diabetes. This compound belongs to which of the following categories?
In both DNA and RNA, heterocyclic base and phosphate ester linkages are at
In both DNA and RNA, heterocyclic base and phosphate ester linkages are at
The term anomers of glucose refers to
The term anomers of glucose refers to
The pyrimidine bases present in DNA are
The pyrimidine bases present in DNA are
The secondary structure of a protein refers to
The secondary structure of a protein refers to
Which one of the following properties is not shown by NO ?
Which one of the following properties is not shown by NO ?
-
(1) It combines with oxygen to form nitrogen dioxide
-
(2) It′s bond order is 2.5
-
(3) It is diamagnetic in gaseous state
-
(4) It is a neutral oxide
Half life of 90Sr is 6.93 years. In a child body 1 g of 90Sr dopped in place of calcium, how many years will it take to reduce its concentration by 90% (Assume no involvement of Sr in metabolism).
Half life of 90Sr is 6.93 years. In a child body 1 
of 90Sr dopped in place of calcium, how many years will it take to reduce its concentration by 90% (Assume no involvement of Sr in metabolism).
Number of chiral centers in chloramphenicol is ?
Number of chiral centers in chloramphenicol is ?
Cl2 on reaction with hot & conc. NaOH gives two chlorine having products X and Y. On treatment with AgNO3, X gives precipitate. Determine average bond order of Cl and O bond in 'Y' ?
Cl2 on reaction with hot & conc. NaOH gives two chlorine having products X and Y. On treatment with AgNO3, X gives precipitate. Determine average bond order of Cl and O bond in 'Y' ?
Each of solution A and B of 100 L containing 4 g NaOH and 9.8 g H2SO4. Find pH of solution which is obtain by mixing 40 L solution of A and 10 L solution of B.
Each of solution A and B of 100 L containing 4 g NaOH and 9.8 g H2SO4. Find pH of solution which is obtain by mixing 40 L solution of A and 10 L solution of B.
An electron is moving with a kinetic energy of . What will be de Broglie wave length for this electron?
An electron is moving with a kinetic energy of 
. What will be de Broglie wave length for this electron?
The velocity of electron in the ground state hydrogen atom is . Its velocity in the second orbit would be
The velocity of electron in the ground state hydrogen atom is 
. Its velocity in the second orbit would be
The species which does not show paramagnetism is
The species which does not show paramagnetism is
The pair having similar geometry is
The pair having similar geometry is
In the formation of N2+ from N2 the electron is removed from
In the formation of N2+ from N2 the electron is removed from
Amongst LiCl, RbCl, BeCl2 and MgCl2 the compounds with greatest and least ionic character respectively are
Amongst LiCl, RbCl, BeCl2 and MgCl2 the compounds with greatest and least ionic character respectively are
The temperature of an ideal gas is increased from 140 K to 560 K. If at 140 K the root mean square velocity of the gas molecule is V, at 560 K it becomes
The temperature of an ideal gas is increased from 140 K to 560 K. If at 140 K the root mean square velocity of the gas molecule is V, at 560 K it becomes
The behaviour of a real gas is usually depicted by plotting compressibility factor Z versus P at a constant temperature. At high temperature and high pressure, Z is usually more than one. This fact can be explained by van der Waals equation when
The behaviour of a real gas is usually depicted by plotting compressibility factor Z versus P at a constant temperature. At high temperature and high pressure, Z is usually more than one. This fact can be explained by van der Waals equation when
X ml of H2 gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of the gas specified below under identical conditions is :
X ml of H2 gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of the gas specified below under identical conditions is :
13.4g of a sample of unstable hydrated salt: Na2SO4 . nH2O was found to contain 6.3g of water. Determine the number of water of crystallisation
13.4g of a sample of unstable hydrated salt: Na2SO4 . nH2O was found to contain 6.3g of water. Determine the number of water of crystallisation
SO2 is angular and CO2 is linear why?
SO2 is angular and CO2 is linear why?
Dipole moment of BF3 is zero.Why?
Dipole moment of BF3 is zero.Why?
BaCO3 has got a higher decomposition temperature than MgCO3?
BaCO3 has got a higher decomposition temperature than MgCO3?
Calculate the ratio of K.E and P.E of an electron in a orbit?
Calculate the ratio of K.E and P.E of an electron in a orbit?
What fraction of the volume of an atom of radius 10–8 cm is occupied by its nucleus if nuclear radius is 10–12 cm?
What fraction of the volume of an atom of radius 10–8 cm is occupied by its nucleus if nuclear radius is 10^-12 cm?
Salts of A (atomic weight 7), B (atomic weight = 27) and C (atomic weight 48) were electrolysed under identical conditions using same quantity of electricity. It was found that when 2.1g of A was deposited, weights of B and C deposited were 2.7g and 7.2g. The valencies of A, B and C are respectively.
Salts of A (atomic weight 7), B (atomic weight = 27) and C (atomic weight 48) were electrolysed under identical conditions using same quantity of electricity. It was found that when 2.1g of A was deposited, weights of B and C deposited were 2.7g and 7.2g. The valencies of A, B and C are respectively.
When mercuric iodide is added to the aqueous solution of KI then the
When mercuric iodide is added to the aqueous solution of KI then the
At 88°C benzene has a vapour pressure of 900 torr and toluene has a vapour pressure of 360 torr. What is the mole fraction of benzene in mixture with toluene that will boil at 88°C at 1 atm pressure assuming ideal solution.
At 88°C benzene has a vapour pressure of 900 torr and toluene has a vapour pressure of 360 torr. What is the mole fraction of benzene in mixture with toluene that will boil at 88°C at 1 atm pressure assuming ideal solution.
The ionisation energy of solid NaCl is 180 kcal/mol. The dissolution of the solid in water is endothermic to the extent of 1 kcal per mol. If the solvation energies of Na+ and Cl– ions are in the ratio 6:5, what is the enthalpy of hydration of sodium ion
The ionisation energy of solid NaCl is 180 kcal/mol. The dissolution of the solid in water is endothermic to the extent of 1 kcal per mol. If the solvation energies of Na+ and Cl– ions are in the ratio 6:5, what is the enthalpy of hydration of sodium ion
The melting point of RbBr is 628°C, while that of NaF is 988°C. The principal reason that melting point of NaF is much higher than that of RbBr is that
The melting point of RbBr is 628°C, while that of NaF is 988°C. The principal reason that melting point of NaF is much higher than that of RbBr is that
The radius of Ag+ ion is 126 pm while that of I– ion is 216 pm. The coordination number of Ag+ in AgI is
The radius of Ag+ ion is 126 pm while that of I– ion is 216 pm. The coordination number of Ag+ in AgI is
In a crystal some ions are missing from normal sites. This is an example of
In a crystal some ions are missing from normal sites. This is an example of
The ratio of closed packed atoms to tetrahedral holes in cubic close packing is
The ratio of closed packed atoms to tetrahedral holes in cubic close packing is
For the reaction are positive. The most favourable conditions for the reaction is
For the reaction 
are positive. The most favourable conditions for the reaction is
Under the same conditions how many ml of 1M KOH and 0.5M H2SO4 solutions respectively when mixed for a total volume of 100 ml produce the highest rise in temperature
Under the same conditions how many ml of 1M KOH and 0.5M H2SO4 solutions respectively when mixed for a total volume of 100 ml produce the highest rise in temperature
200 ml of He at 0.66 atm pressure and 400 ml of O2 at 0.52 atm pressure are mixed in a 400 ml vessel at 25°C. The partial pressure of He and O2 will be?
200 ml of He at 0.66 atm pressure and 400 ml of O2 at 0.52 atm pressure are mixed in a 400 ml vessel at 25°C. The partial pressure of He and O2 will be?
Two identical bulbs containing ideal gases A and B are taken. Density of A is twice that of B .Mol wt. of A is half that of B.If two gases are at the same temperature, the ratio of pressure of A & B is
Two identical bulbs containing ideal gases A and B are taken. Density of A is twice that of B .Mol wt. of A is half that of B.If two gases are at the same temperature, the ratio of pressure of A & B is
At what temperature, the average speed of gas molecules will be double that at 27°C ?
At what temperature, the average speed of gas molecules will be double that at 27°C ?
2 g of a gas A is introduced into an evacuated flask kept at 25°C. The pressure is found to be 1 atm. If 3 g of another gas B is added to the same flask the total pressure becomes 1.5 atm, assuming ideal gas behaviour. The ratio of molecular weight of gas A to gas B (MA : MB) is
2 g of a gas A is introduced into an evacuated flask kept at 25°C. The pressure is found to be 1 atm. If 3 g of another gas B is added to the same flask the total pressure becomes 1.5 atm, assuming ideal gas behaviour. The ratio of molecular weight of gas A to gas B (MA : MB) is
50 ml of mixture of NH3 and H2 are decomposed to yield N2 and H2 and to the resulting mixture 40 ml O2 is added and the mixture is sparked to yield H2O. When the resulting mixture of gases were passed through alkaline pyrogallol 6 ml contraction was observed. Calculate the percentage composition of NH3 in the original mixture
50 ml of mixture of NH3 and H2 are decomposed to yield N2 and H2 and to the resulting mixture 40 ml O2 is added and the mixture is sparked to yield H2O. When the resulting mixture of gases were passed through alkaline pyrogallol 6 ml contraction was observed. Calculate the percentage composition of NH3 in the original mixture
A 10 cm air column is trapped inside the tube (having uniform area of cross section) by 6 cm of Hg and is placed horizontally to the plane. Calculate the length of air column when the tube is placed vertically with opened end up.
A 10 cm air column is trapped inside the tube (having uniform area of cross section) by 6 cm of Hg and is placed horizontally to the plane. Calculate the length of air column when the tube is placed vertically with opened end up.
A vertical hollow cylinder of height 152 cm is fitted with a weightless piston. The lower half is filled with an ideal gas and the upper half with mercury.The cylinder is now heated at300K,so that 1/4th of the mercury comes out.Find the temperature at which it will happen assuming thermal expansion of Hg to be negligible
A vertical hollow cylinder of height 152 cm is fitted with a weightless piston. The lower half is filled with an ideal gas and the upper half with mercury.The cylinder is now heated at300K,so that 1/4th of the mercury comes out.Find the temperature at which it will happen assuming thermal expansion of Hg to be negligible
The mass percent composition of dry air at sea level is given. The partial pressure of each component will be
The mass percent composition of dry air at sea level is given. The partial pressure of each component will be
Five molecules of a gas moving with speeds 1, 2, 3, 4, 5 km/s. What is their root mean square speed?
Five molecules of a gas moving with speeds 1, 2, 3, 4, 5 km/s. What is their root mean square speed?
Two samples of gases A and B are at the same temperature. The molecules of A are travelling four times faster than the molecules of B. The ratio of mA / mB
Two samples of gases A and B are at the same temperature. The molecules of A are travelling four times faster
than the molecules of B. The ratio of mA / mB
The term that corrects for the attractive forces present in a real gas in the van der Waals equation is
The term that corrects for the attractive forces present in a real gas in the van der Waals equation is
1 mole of gas H2 and 4 moles of gas O2 is taken inside the vessel, which effuse through a small orifice of the vessel having same area of cross section and at the same temperature, then which is the correct % of effused volume of gas H2 and O2 initially respectively? (Assume that the gas H2 does not react with O2 gas)
1 mole of gas H2 and 4 moles of gas O2 is taken inside the vessel, which effuse through a small orifice of the vessel having same area of cross section and at the same temperature, then which is the correct % of effused volume of gas H2 and O2 initially respectively? (Assume that the gas H2 does not react with O2 gas)
0.2 g of a gas X occupies a volume of 0.44 litre at given pressure and temperature. Under identical conditions of P and T, 0.1 g of CO2 gas occupies 0.32 L volume. The gas X can be
0.2 g of a gas X occupies a volume of 0.44 litre at given pressure and temperature. Under identical conditions of P and T, 0.1 g of CO2 gas occupies 0.32 L volume. The gas X can be
Knowing rate of disappearance
For an elementary reaction
Calculate rms speed of O2 at 273 K and 1 *10^5Pa pressure. The density of O2 under these conditions is 1.42 kg m–3.
Calculate rms speed of O2 at 273 K and 1 * 10^5Pa pressure. The density of O2 under these conditions is 1.42 kg m–3.
Calculate the pressure exerted on the walls of a 3 litre flask when 7 gms of N2 are introduced into the same at 27°C.
Calculate the pressure exerted on the walls of a 3 litre flask when 7 gms of N2 are introduced into the same at 27°C.
Explain the following a) Although Au is soluble in aqua-regia, Ag is not b) Zinc and hot copper is used for recovery of Ag from the complex [Ag(CN)2]– c) Aluminium metal is frequently used as a reducing agent for extraction of metal such as chromium manganese etc. d) Partial roasting of sulphide ore is done in the metallurgy of copper.
Explain the following
a) Although Au is soluble in aqua-regia, Ag is not
b) Zinc and hot copper is used for recovery of Ag from the complex [Ag(CN)2]–
c) Aluminium metal is frequently used as a reducing agent for extraction of metal such as chromium manganese etc.
d) Partial roasting of sulphide ore is done in the metallurgy of copper.
Cinnabar (HgS) and galena (PbS) on roasting often gives their respective metals but zinc blende (ZnS) does not. Explain.
Cinnabar (HgS) and galena (PbS) on roasting often gives their respective metals but zinc blende (ZnS) does not. Explain.
Aluminium cannot be prepared by the electrolysis of aqueous solution of its salts. Why?
Aluminium cannot be prepared by the electrolysis of aqueous solution of its salts. Why?
Write short notes on Amalgamation , Hydrometallurgy, Self reduction, Electrolytic reduction?
Write short notes on Amalgamation , Hydrometallurgy, Self reduction, Electrolytic reduction?
The half-life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2 = 0.301)
The half-life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2 = 0.301)
One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is?
One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is?
Solubility product of silver bromide is 5.0 × 10–13. The quantity of potassium bromide (molar mass taken as 120 g mol–1) to be added to 1 litre of 0.05 M solution of silver nitrate to start the precipitation of AgBr is
Solubility product of silver bromide is 5.0 × 10–13. The quantity of potassium bromide (molar mass taken as 120 g mol–1) to be added to 1 litre of 0.05 M solution of silver nitrate to start the precipitation of AgBr is
At 25°C, the solubility product of Mg(OH)2 is 1.0 × 10–11. At which pH, will Mg2+ ions start precipitating in the form of Mg(OH)2 from a solution of 0.001 M Mg2+ ions ?
At 25°C, the solubility product of Mg(OH)2 is 1.0 × 10–11. At which pH, will Mg2+ ions start precipitating in the form of Mg(OH)2 from a solution of 0.001 M Mg2+ ions ?
The polymer containing strong intermolecular forces e.g., hydrogen bonding is?
The polymer containing strong intermolecular forces e.g., hydrogen bonding is?
29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in 20 mL of 0.1 M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralisation. The percentage of nitrogen in the compound is?
29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in 20 mL of 0.1 M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralisation. The percentage of nitrogen in the compound is?
In which of the following species the interatomic bond angle is 109° 28'?
In which of the following species the interatomic bond angle is 109° 28'?
Number of sigma bonds in is
Number of sigma bonds in 
is
In a hydrogen atom, if energy of an electron in ground state is 13.6 eV, then that in the 2nd excited state is
In a hydrogen atom, if energy of an electron in ground state is 13.6 eV, then that in the 2nd excited state is
In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following interorbit jumps of the electron for Bohr orbits in an atom of hydrogen?
In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following interorbit jumps of the electron for Bohr orbits in an atom of hydrogen?
Uncertainty in position of a minute particle of mass 25 g in space is 10–5 m. What is the uncertainty in velocity?
Uncertainty in position of a minute particle of mass 25 g in space is 10–5 m. What is the uncertainty in velocity?
According to Bohr’s theory, the angular momentum of an electron in 5th orbit is
According to Bohr’s theory, the angular momentum of an electron in 5th orbit is
In a multielectron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields? (i) n=1,l=0,m=0 (ii) n=2,l=0,m=0 (iii) n=2,l=1,m=1 (iv) n=3,l=2,m=1 (v) n=3,l=2,m=0
In a multielectron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields?
(i) n=1,l=0,m=0
(ii) n=2,l=0,m=0
(iii) n=2,l=1,m=1
(iv) n=3,l=2,m=1
(v) n=3,l=2,m=0
The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 metres per second is approximately
The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 metres per second is approximately
The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 metres per second is approximately
The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 metres per second is approximately
The ionization enthalpy of hydrogen atom is 1.312 × 106 J mol–1. The energy required to excite the electron in the atom from n=1 to n=2 is
The ionization enthalpy of hydrogen atom is 1.312 × 106 J mol–1. The energy required to excite the electron in the atom from n=1 to n=2 is
The metal extracted by leaching with a cyanide is
The metal extracted by leaching with a cyanide is
Solubility of Ca(OH)2 is s mol L-1. What is the solubility product (Ksp) under the same condition?
Solubility of Ca(OH)2 is s mol L-1. What is the solubility product (Ksp) under the same condition?
Heat required to raise the temperature of 1 mole of a substance by 1° is called?
Heat required to raise the temperature of 1 mole of a substance by 1° is called?
is emitted in a radioactive reaction when
is emitted in a radioactive reaction when
In a mixture of A and B, components show negative deviation when :
In a mixture of A and B, components show negative deviation when :
Aluminium is extracted by the electrolysis of alumina / bauxite / molten cryolite / alumina mixed with molten cryolite
Aluminium is extracted by the electrolysis of alumina / bauxite / molten cryolite / alumina mixed with molten cryolite
For an aqueous solution, freezing point is - 0.186°C. Elevation of the boiling point of the same solution is (Kf = 1.86° mo1-1 kg and Kb = 0.512° mol-1 kg)
For an aqueous solution, freezing point is - 0.186°C. Elevation of the boiling point of the same solution is (Kf = 1.86° mo1-1 kg and Kb = 0.512° mol-1 kg)
Which of the following is a redox reaction?
Which of the following is a redox reaction?
For an ideal gas, number of mol per liter in terms of its pressure P, temperature T and gas constant R is
For an ideal gas, number of mol per liter in terms of its pressure P, temperature T and gas constant R is
What is the number of bonds in ?
What is the number of 
bonds in 
?
Why is used in space and submarines?
Why 
is used in space and submarines?
Which of the following ions has the maximum magnetic moment?
Which of the following ions has the maximum magnetic moment?
Acetylene does not react with (a) Na (b) ammoniacal AgNO3 (c) HC1 (d) NaOH
Acetylene does not react with
(a) Na
(b) ammoniacal AgNO3
(c) HC1
(d) NaOH
What is compound A in given below image?
What is compound A in given below image?
For the following cell with hydrogen electrodes at two different pressures P1 and P2 emf is given b
For the following cell with hydrogen electrodes at two different pressures P1 and P2
emf is given b
Acetylene reacts with hypochlorous acid to form.
Acetylene reacts with hypochlorous acid to form.
On heating benzyl amine with chloroform and ethanolic KOH, product obtained is
On heating benzyl amine with chloroform and ethanolic KOH, product obtained is
Which of the following reaction is possible at anode?
Which of the following reaction is possible at anode?
Which of the following concentration factor is affected by the change in temperature?
Which of the following concentration factor is affected by the change in temperature?
Cyanide process is used for the extraction of: (a) barium (b) silver (c) boron (d) zinc
Cyanide process is used for the extraction of:
(a) barium (b) silver
(c) boron (d) zinc
A metal M forms water soluble and inert MO. MO in aqueouS solution forms insoluble soluble in NaOH. Metal M is
A metal M forms water soluble 
and inert MO. MO in aqueouS solution forms insoluble 
soluble in NaOH. Metal M is
Half-life of a substance A following first order Kinetics is 5 days. Starting with 100g of A, amount left after 15 days is:
Half-life of a substance A following first order Kinetics is 5 days. Starting with 100g of A, amount left after 15 days is:
The most stable ion is : / / /
The most stable ion is :
/ 
/ 
/ 
A substance forms Zwitter ion. It can have functional groups :
A substance forms Zwitter ion. It can have functional groups :
If FE3+ and Cr3+ both are present in group III of qualitative analysis, then distinction can be made by :
If FE3+ and Cr3+ both are present in group III of qualitative analysis, then distinction can be made by :
In an organic compound of molar mass 108 g mol-1 C, H and N atoms are present in 9 : 1 : 3.5 by weight. Molecular formula can be:
In an organic compound of molar mass 108 g mol-1 C, H and N atoms are present in 9 : 1 : 3.5 by weight. Molecular formula can be:
Which is the correct order of atomic sizes? (At. Nos. : Ce = 58, Sn = 50, Yb = 70 and Lu = 71)
Which is the correct order of atomic sizes?
(At. Nos. : Ce = 58, Sn = 50, Yb = 70 and Lu = 71)
According to the periodic law of elements, the variation in properties of elements is related to their
According to the periodic law of elements, the variation in properties of elements is related to their
Lattice energy of an ionic compound depends upon
Lattice energy of an ionic compound depends upon
Which among the following factors is the most important in making fluorine the strongest oxidising agent?
Which among the following factors is the most important in making fluorine the strongest oxidising agent?
Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point?
Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point?
Which one of the following ions has the highest value of ionic radius?
Which one of the following ions has the highest value of ionic radius?
The increasing order of the first ionisation enthalpies of the elements B, P, S and F (lowest first) is
The increasing order of the first ionisation enthalpies of the elements B, P, S and F (lowest first) is
Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture?
Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture?
Which one of the following groupings represents a collection of isoelectronic species?
Which one of the following groupings represents a collection of isoelectronic species?
The decreasing values of bond angles from NH3 (106°) to SbH3 (101°) down group15 of the periodic table is due to
The decreasing values of bond angles from NH3 (106°) to SbH3 (101°) down group15 of the periodic table is due to
Freezing point of an aqueous solution is (–0.186)°C. Elevation of boiling point of the same solution is K b = 0.512°C, K f = 1.86°C, find theincrease in boiling point.
Freezing point of an aqueous solution is (–0.186)°C. Elevation of boiling point of the same solution is K b = 0.512°C, K f = 1.86°C, find the
increase in boiling point.
In a 0.2 molal aqueous solution of a weak acid HX, the degree of ionization is 0.3. Taking Kf for water as 1.85, the freezing point of the solution will be nearest to
In a 0.2 molal aqueous solution of a weak acid HX, the degree of ionization is 0.3. Taking Kf for water as 1.85, the freezing point of the solution will be nearest to
25 ml of a solution of barium hydroxide on titration with a 0.1 molar solution of hydrochloric acid gave a litre value of 35 ml. The molarity of barium hydroxide solution was
25 ml of a solution of barium hydroxide on titration with a 0.1 molar solution of hydrochloric acid gave a litre value of 35 ml. The molarity of barium hydroxide solution was
If liquids A and B form an ideal solution, the
If liquids A and B form an ideal solution, the
6.02 × 10^20 molecules of urea are present in 100 ml of its solution. The concentration of urea solution is
6.02 × 10^20 molecules of urea are present in 100 ml of its solution. The concentration of urea solution is
To neutralise completely 20 mL of 0.1 M aqueous solution of phosphorous acid (H3PO3), the volume of 0.1 M aqueous KOH solution required is
To neutralise completely 20 mL of 0.1 M aqueous solution of phosphorous acid (H3PO3), the volume of 0.1 M aqueous KOH solution required is
Benzene and toluene form nearly ideal solutions. At 20°C, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20°C for a solution containing 78 g of benzene and 46 g of toluene in torr is
Benzene and toluene form nearly ideal solutions. At 20°C, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20°C for a solution containing 78 g of benzene and 46 g of toluene in torr is
Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 ml of 1.5 M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final mixture?
Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 ml of 1.5 M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final mixture?
Equimolal solutions in the same solvent have
Equimolal solutions in the same solvent have
The vapour pressure of water at 20°C is 17.5 mm Hg. If 18 g of glucose (C6H12O6) is added to 178.2 g of water at 20°C, the vapour pressure of the resulting solution will be
The vapour pressure of water at 20°C is 17.5 mm Hg. If 18 g of glucose (C6H12O6) is added to 178.2 g of water at 20°C, the vapour pressure of the resulting solution will be
An organic liquid with sweet smell and b.pt 78°C contains C, H and O. On heating with conc. H2SO4 gives a gaseous product (B) of empirical formula (CH2)n. Compound (B) decolourises bromine water and alk. KMnO4. (B) also reacts with one mole of H2 in presence of Ni. What are (A) and (B)?
An organic liquid with sweet smell and b.pt 78°C contains C, H and O. On heating with conc. H2SO4 gives a gaseous product (B) of empirical formula (CH2)n. Compound (B) decolourises bromine water and alk. KMnO4. (B) also reacts with one mole of H2 in presence of Ni. What are (A) and (B)?
Sulphanilic acid although has acidic as well as basic group, it is soluble in alkali but insoluble in mineral acid
Sulphanilic acid although has acidic as well as basic group, it is soluble in alkali but insoluble in mineral acid
Although both polymers are prepared by free radical processes, poly (vinyl chloride) is amorphous and poly (vinylidene chloride) (saran) is highly crystallilne. How do you account for the different? (vinylidene chloride is 1,1- dichloroethene).
Although both polymers are prepared by free radical processes, poly (vinyl chloride) is amorphous and poly (vinylidene chloride) (saran) is highly crystallilne. How do you account for the different? (vinylidene chloride is 1,1- dichloroethene).
Treatment of (+)– glucose with HIO4 gives results that confirm its aldohexose structure. What product should be formed, and how much HIO4 should be consumed?
Treatment of (+)– glucose with HIO4 gives results that confirm its aldohexose structure. What product should be formed, and how much HIO4 should be consumed?
If for a reaction then:
If 
for a reaction then:
If the enthalpy of vaporistion for water is 186.5 kJ/mol, its entropy of vaporistion will be
If the enthalpy of vaporistion for water is 186.5 kJ/mol, its entropy of vaporistion will be
The heat of combustion of CS2 is –3.24 kcal. For the reaction,
The heat of combustion of CS2 is –3.24 kcal. For the reaction,
The heat of combustion of propane C3H8(g) is = –2280 kJ /mol. For the combustion of 1.00 m3 of C3H8(g) measured at 25° C annd 1 atm pressure, =
The heat of combustion of propane C3H8(g) is 
= –2280 kJ /mol. For the combustion of 1.00 m3 of C3H8(g) measured at 25° C annd 1 atm pressure, =
The dissociation energy of CH4 and C2H6 are respectively 360 & 620 k. cal/mole. The bond energy of C–C is
The dissociation energy of CH4 and C2H6 are respectively 360 & 620 k. cal/mole. The bond energy of C–C is
The heat of neutralisation of HCl by NaOH is –12.1 kJ/mole, the energy of dissociation of HCN is
The heat of neutralisation of HCl by NaOH is –12.1 kJ/mole, the energy of dissociation of HCN is
The difference between the heat of reaction of constant pressure and constant volume for the reaction
The difference between the heat of reaction of constant pressure and constant volume for the reaction
