Chemistry Questions
Half life of 90Sr is 6.93 years. In a child body 1 ug 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 ug 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).
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?
Purest form of commercial iron is?
Purest form of commercial iron is?
What is the wavelength emitted during the transition of electron in between two levels of Li2+ ion whose sum is 4 and difference is 2?
Calculate the wavelength emitted during the transition of electron in between two levels of Li2+ ion whose sum is 4 and difference is 2.
Why electron cannot exist inside the nucleus according to Heisenberg’s uncertainty principle?
Why electron cannot exist inside the nucleus according to Heisenberg’s uncertainty principle?
Which one of the following in has the highest value of ionic radius. (A) Li+ (b) B³+(c)o²-(d)F-
Which one of the following in has the highest value of ionic radius.
Why Berilium and Al are placed in different periods and groups but they show the similar properties?
Why Berilium and Al are placed in different periods and groups but they show similar properties?
Why The radii of Ar is greater than the radii of chlorine?
Why The radii of Ar is greater than the radii of chlorine?
A current of 3 ampere was passed for 2 hours through a solution of CuSO4. 3 gm of Cu2+ ions were discharged at cathode calculate the current efficiency.
A current of 3 ampere was passed for 2 hours through a solution of CuSO4. 3 gm of Cu2+ ions were discharged at cathode calculate the current efficiency.
1 mL of 10–5 M HCl solution is diluted to 1000 mL. Calculate the pH of the resulting solution?
1 mL of 10–5 M HCl solution is diluted to 1000 mL. Calculate the pH of the resulting solution?
A sample of a gas initially at 27°C is compressed from 40 litres to 4 litres adiabatically and reversibly. Calculate the final temperature (Cv = 5 cal/mole)
A sample of a gas initially at 27°C is compressed from 40 litres to 4 litres adiabatically and reversibly. Calculate the final temperature (Cv = 5 cal/mole)
Copper sulphate solution (250 ml) was electrolyzed using a platinum anode and copper cathode. A constant current of 2 mA was passed for 16 minute. It was found that after electrolysis, the absorbance of the solution was reduced to 50% of its original value. Calculate the concentration of copper sulphate ion in the solution to begin with.
Copper sulphate solution (250 ml) was electrolyzed using a platinum anode and copper cathode. A constant current of 2 mA was passed for 16 minute. It was found that after electrolysis, the absorbance of the solution was reduced to 50% of its original value. Calculate the concentration of copper sulphate ion in the solution to begin with.
The configuration of the C-2 epimer of D-glucose is?
The configuration of the C-2 epimer of D-glucose is
In low temperature range fraction of heat supplied to an ideal diatomic gas system, at constant pressure, which bring change in its internal energy is approx.......?
In low temperature range fraction of heat supplied to an ideal diatomic gas system, at constant pressure, which bring change in its internal energy is approx.......?
A compound is composed of two elements A and B, element A constitute f.c.c. lattice, while B occupy all the tetrahedral voids, in this way another simple cubic is constituted by element B, inside the fcc unit cell of element A. If all the points/particles along any one edge of inner cube of every unit cell, are missing then what is the new empirical formula of the compound
A compound is composed of two elements A and B, element A constitute f.c.c. lattice, while B occupy all the tetrahedral voids, in this way another simple cubic is constituted by element B, inside the fcc unit cell of element A. If all the points/particles along any one edge of inner cube of every unit cell, are missing then what is the new empirical formula of the compound?
In low temperature range fraction of heat supplied to an ideal diatomic gas system, at constant pressure, which bring change in its internal energy is approx.?
In low temperature range fraction of heat supplied to an ideal diatomic gas system, at constant pressure, which bring change in its internal energy is approx.?
Resonance Energy of Toluene is 37.5 kcal/mol while that of Benzene is 36 kcal/mole then which of the following explains this difference?
Resonance Energy of Toluene is 37.5 kcal/mol while that of Benzene is 36 kcal/mole then which of the following explains this difference?
How many acyclic isomer(s) is/are possible with formula C4H8?
How many acyclic isomer(s) is/are possible with formula C4H8?
How many minimum number of chlorine atom(s) does a polychloride contain, which on hydrolysis forms a beta - keto acid?
How many minimum numbers of chlorine atom(s) does a polychloride contain, which on hydrolysis forms a beta - keto acid?
Volume of a gas at a particular temperature and on atmospheric pressure is 200 ml. Keeping the temperature constant if pressure is increased to 5 atmosphere, then volume of the gas will be(if P1V1 = P2V2 )
Volume of a gas at a particular temperature and on atmospheric pressure is 200 ml. Keeping the temperature constant if pressure is increased to 5 atmosphere, then volume of the gas will be(if P1V1 = P2V2 )
The C = C bond dissociation energy is 146 kcal/mole whereas C – C bond dissociation energy is 83 kcal/mole then whey paraffins are less reactive than olefins.
The C = C bond dissociation energy is 146 kcal/mole whereas C – C bond dissociation energy is 83 kcal/mole then whey paraffins are less reactive than olefins.
Why Al(OH)3 is amphoteric in nature?
Why Al(OH)3 is amphoteric in nature?
A diatomic molecule has dipole moment of 1.2 D. If the bond distance is 1.0 A. What fraction of an electronic charge ‘e’ exists on each atom?
A diatomic molecule has dipole moment of 1.2 D. If the bond distance is 1.0 A. What fraction of an electronic charge ‘e’ exists on each atom?
Compare the bond energies of N2, N2+ & N2-/
Compare the bond energies of
O-nitrophenol is more volatile than p-nitrophenol. Explain?
O-nitrophenol is more volatile than p-nitrophenol. Explain?
p-isomer will be having highest dipole moment since dipole moment of – CF3 group is reinforced to maximum extent in this case by – CH3 group. (One is electron withdrawing and other is electron releasing.
p-isomer will be having highest dipole moment since dipole moment of – CF3 group is reinforced to maximum extent in this case by – CH3 group. (One is electron withdrawing and other is electron releasing.
Calculate the percentage of ionic character of HI having bond length = 1.62Å and observed dipole moment = 0.39 D.
Calculate the percentage of ionic character of HI having bond length = 1.62Å and observed dipole moment = 0.39 D.
Na2CO3 does not decompose on heating whereas CaCO3 decomposes, why?
Na2CO3 does not decompose on heating whereas CaCO3 decomposes, why?
Among PCl3 & PF3 which is having greater bond angle and why?
Among PCl3 & PF3 which is having greater bond angle and why?
CO2 has got dipole moment of zero why?
CO2 has got dipole moment of zero why?
The solubility of the hydroxides of the alkaline earth metals increases i.e. Ba(OH)2 has got a higher solubility in water compared to Mg(OH)2?
The solubility of the hydroxides of the alkaline earth metals increases i.e. Ba(OH)2 has got a higher solubility in water compared to Mg(OH)2?
The melting point of KCl is higher than that of AgCl though the crystal radii of Ag+ and K+ ions are almost same.Why?
The melting point of KCl is higher than that of AgCl though the crystal radii of Ag+ and K+ ions are almost same.Why?
Out of H2O and H2S which is having greater bond angle and why?
Out of H2O and H2S which is having greater bond angle and why?
Explain why the bond angle of H2O is 104° while that that of F2O is 102°?
Explain why the bond angle of H2O is 104° while that that of F2O is 102°?
Why bond angle in NH3 is 107° while in H2O it is 104.5°. Though the central atom in both the molecules is sp3 hybridized?
Why bond angle in NH3 is 107° while in H2O it is 104.5°. Though the central atom in both the molecules is sp3 hybridized.
Why the bond angle of H–C–H in methane(CH4) is 109° 28’ while H–N–H bond angle in NH3 is 107° though both carbon and nitrogen are sp3 hybridized.
Why the bond angle of H–C–H in methane(CH4) is 109° 28’ while H–N–H bond angle in NH3 is 107° though both carbon and nitrogen are sp3 hybridized.
Classify the following bonds as ionic, polar covalent or covalent and give your answer?
Classify the following bonds as ionic, polar covalent or covalent and give your answer:
(a) Si - Si bond in 
(b) Si - Cl bond in
(c) Ca - F bond in CaF2
(d) N - H bond in NH3
Calculate the minimum and maximum number of electrons which may have magnetic quantum number, m = +1 and spin quantum number s = - 1/2 in chromium(Cr):
Calculate the minimum and maximum number of electrons which may have magnetic quantum number, m = +1 and spin quantum number s = - 1/2 in chromium(Cr):
Graphite is a soft solid lubricant extremely difficult to smelt. The reason for this anomalous behaviour is that graphite?
Graphite is a soft solid lubricant extremely difficult to smelt. The reason for this anomalous behaviour is that graphite?
Boron compounds behave as Lewis acid because of?
Boron compounds behave as Lewis acid because of?
Out of N, O, Ne, Na, Na+, select the species which have maximum and minimum ionization energy?
Out of N, O, Ne, Na, Na+, select the species which have maximum and minimum ionization energy?
The conversion of ozone into oxygen is exothermic under what conditions is ozone is most stable?
The conversion of ozone into oxygen is exothermic under what conditions is ozone is most stable?
hc
Sample of 2,3 dibromopentane is heat in zinc dust the resulting compound is isolated and heated with hi in presence of p to yield---------
In a crystal structure of an element, atoms are present in ccp arrangement and tetrahedral voids, which of the following relation between the atomic radius and edge length is correct for the unit cell which is formed in this arrangement? (a is the edge length and R is the radius of atom)
In a crystal structure of an element, atoms are present in ccp arrangement and tetrahedral voids, which of the following relation between the atomic radius and edge length is correct for the unit cell which is formed in this arrangement? (a is the edge length and R is the radius of atom)
The pH of a H2 SO4 solution is 2. The pH of this solution, if equal volume of 0.2 M NaCl solution is added to it, will be?
The pH of a H2 SO4 solution is 2. The pH of this solution, if equal volume of 0.2 M NaCl solution is added to it, will be:
What are anisotropic substance
How many maximum number of electrons of an atom have the following set of quantum numbers? n = 4, l = 0, 1, 2, m = 0, +1, s = -1⁄2
How many maximum number of electrons of an atom have the following set of quantum numbers? n = 4, l = 0, 1, 2, m = 0, +1, s = -1⁄2
What is the azimuthal quantum number of the unpaired electron of chlorine?
What is the azimuthal quantum number of the unpaired electron of chlorine?
The electron of hydrogen atom was excited from ground state to a higher orbit. During de-excitation of the electron, photons of six different wavelengths were emitted. If each photon forms a spectral line, how many spectral line will be visible to naked eye?
The electron of hydrogen atom was excited from ground state to a higher orbit. During de-excitation of the electron, photons of six different wavelengths were emitted. If each photon forms a spectral line, how many spectral line will be visible to naked eye?
What is the sum of the number of electrons with l = 0 and l = 2 present in Cu+ ion?
What is the sum of the number of electrons with l = 0 and l = 2 present in Cu+ ion?
The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1 : 4. The ratio of number of their molecule is ?
The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1 : 4. The ratio of number of their molecule is ?
For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of M/10 sulphuric acid. The unreacted acid required 20 mL of M/10 sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is ?
For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of M/10 sulphuric acid. The unreacted acid required 20 mL of M/10 sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is ?
Calculate the pH of an acetate buffer that is a mixture with 0.10 M acetic acid and 0.10 M sodium acetate?
Calculate the pH of an acetate buffer that is a mixture with 0.10 M acetic acid and 0.10 M sodium acetate?
for reaction ab[g] give rise to a[g]+b[g] .ab is 33% dissociated the total pressure of equilibrium system is p atm therefore p is related to kp is
for reaction ab[g] give rise to a[g]+b[g] .ab is 33% dissociated the total pressure of equilibrium system is p atm therefore p is related to kp is
on adding 100ml of 0.4 gl-1 of naoh to 500 ml sol of a buffer changed its ph by 0.5 what is the buffer capacity of buffer mixture
on adding 100ml of 0.4 gl-1 of naoh to 500 ml sol of a buffer changed its ph by 0.5 what is the buffer capacity of buffer mixture
heat of neutralization of h2c2o4 is -26 kcal/mol the dissociation energy of h2c2o4 is
heat of neutralization of h2c2o4 is -26 kcal/mol the dissociation energy of h2c2o4 is
equilibrium-The equilibrium constant of the reaction CH3COOH (l)+C2H5OH (l)=CH3COOC2H5+H2O is 4.if one mole of each of acetic acid and ethyl alcohol are heated in presence of little concentrated H2SO4 at equilibrium the amount of ester present is
The equilibrium constant of the reaction CH3COOH (l)+C2H5OH (l)=CH3COOC2H5+H2O is 4.if one mole of each of acetic acid and ethyl alcohol are heated in presence of little concentrated H2SO4 at equilibrium the amount of ester present is
On heating an aliphatic primary amine with chloroform and ethanolic potassium hydroxide, the organic compound formed is?
On heating an aliphatic primary amine with chloroform and ethanolic potassium hydroxide, the organic compound formed is?
solid state
an elemental crystal has a density of 8570kgm3 the packing efficiency is 0.68 if closest distance b/w neighbouring atom is 2.86 angstrom the mass of 1 atom
A first order reaction gets 90% completed in 40 minute. Find out the half-life period of the reaction?
A first order reaction gets 90% completed in 40 minute. Find out the half-life period of the reaction?
A gaseous reaction : 2A(g) + B(g) -> 2C(g), Show a decrease in pressure from 120 mm to 100 mm in 10 minutes. The rate of appearance of C is?
A gaseous reaction : 2A(g) + B(g) -> 2C(g),
Show a decrease in pressure from 120 mm to 100 mm in 10 minutes. The rate of appearance of C is
An organic compound is found to contain C, H and O as elements. It is soluble in water. chars with conc. sulphuric acid and also gives purple colour and Molisch reagent. The solution test is negative but it forms a blue colour with iodine. The organic compound should be
An organic compound is found to contain C, H and O as elements. It is soluble in water. chars with conc. sulphuric acid and also gives purple colour and Molisch reagent. The solution test is negative but it forms a blue colour with iodine. The organic compound should be?
Explain Characteristics of chemisorption
Characteristics of chemisorption
Explain Characteristics of physisorption
Explain Characteristics of physisorption
Types of Adsorption
Types of Adsorption
Explain Mechanism of Adsorption.
Explain Mechanism of Adsorption.
Distinction between Adsorption and Absorption
Distinction between Adsorption and Absorption
What is Adsorption, please explain
What is Adsorption, please explain
0.6 mL of acetic acid (CH3COOH), having density 1.06 g mL–1, is dissolved in 1 litre of water. The depression in freezing point observed for this strength of acid was 0.0205°C. Calculate the van’t Hoff factor and the dissociation constant of acid
0.6 mL of acetic acid (CH3COOH), having density 1.06 g mL–1, is dissolved in 1 litre of water. The depression in freezing point observed for this strength of acid was 0.0205°C. Calculate the van’t Hoff factor and the dissociation constant of acid.
1.00 g of a non-electrolyte solute dissolved in 50 g of benzene lowered the freezing point of benzene by 0.40 K. The freezing point depression constant of benzene is 5.12 K kg mol–1. Find the molar mass of the solute
1.00 g of a non-electrolyte solute dissolved in 50 g of benzene lowered the freezing point of benzene by 0.40 K. The freezing point depression constant of benzene is 5.12 K kg mol–1. Find the molar mass of the solute
45 g of ethylene glycol (C2H6O2) is mixed with 600 g of water. Calculate (a) the freezing point depression and (b) the freezing point of the solution
45 g of ethylene glycol (C2H6O2) is mixed with 600 g of water. Calculate (a) the freezing point depression and (b) the freezing point of the solution
WHat is Osmosis and Osmotic Pressure ?
WHat is Osmosis and Osmotic Pressure ?
1.00 g of a non-electrolyte solute dissolved in 50 g of benzene lowered the freezing point of benzene by 0.40 K. The freezing point depression constant of benzene is 5.12 K kg mol–1. Find the molar mass of the solute
1.00 g of a non-electrolyte solute dissolved in 50 g of benzene lowered the freezing point of benzene by 0.40 K. The freezing point depression constant of benzene is 5.12 K kg mol–1. Find the molar mass of the solute
45 g of ethylene glycol (C2H6O2) is mixed with 600 g of water. Calculate (a) the freezing point depression and (b) the freezing point of the solution
45 g of ethylene glycol (C2H6O2) is mixed with 600 g of water. Calculate (a) the freezing point depression and (b) the freezing point of the solution
The boiling point of benzene is 353.23 K. When 1.80 g of a non-volatile solute was dissolved in 90 g of benzene, the boiling point is raised to 354.11 K. Calculate the molar mass of the solute. Kb for benzene is 2.53 K kg mol–1
The boiling point of benzene is 353.23 K. When 1.80 g of a non-volatile solute was dissolved in 90 g of benzene, the boiling point is raised to 354.11 K. Calculate the molar mass of the solute. Kb for benzene is 2.53 K kg mol–1
The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5 g when added to 39.0 g of benzene (molar mass 78 g mol-1). Vapour pressure of the solution, then, is 0.845 bar. What is the molar mass of the solid substance?
The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5 g when added to 39.0 g of benzene (molar mass 78 g mol-1). Vapour pressure of the solution,
then, is 0.845 bar. What is the molar mass of the solid substance?
What is Non-ideal Solutions?
What is Non-ideal Solutions?
WHat is Ideal Solutions ?
WHat is Ideal Solutions ?
Please explain Raoult’s Law as a special case of Henry’s Law..
Please explain Raoult’s Law as a special case of Henry’s Law ..
Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 298 K are 200 mm Hg and 415 mm Hg respectively. (i) Calculate the vapour pressure of the solution prepared by mixing 25.5 g of CHCl3 and 40 g of CH2Cl2 at 298 K and, (ii) mole fractions of each component in vapour phase.
Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 298 K are 200 mm Hg and 415 mm Hg respectively. (i) Calculate the vapour pressure of the solution prepared by mixing 25.5 g of CHCl3 and 40 g of H2Cl2 at 298 K and, (ii) mole fractions of each component in vapour phase.
What is Raoult’s law ?
What is Raoult’s law ?
What is Effect of Temperature on Solubility?
What is Effect of Temperature on Solubility?
Explain the Biological phenomena of Henry’s law
Explain the Biological phenomena of Henry’s law
If N2 gas is bubbled through water at 293 K, how many millimoles of N2 gas would dissolve in 1 litre of water. Assume that N2 exerts a partial pressure of 0.987 bar. Given that Henry’s law constant for N2 at 293 K is 76.48 kbar.
If N2 gas is bubbled through water at 293 K, how many millimoles of N2 gas would dissolve in 1 litre of water. Assume that N2 exerts a partial pressure of 0.987 bar. Given that Henry’s law constant for N2 at 293 K is
76.48 kbar.
What is Solubility please explain
What is Solubility please explain
Calculate molality of 2.5 g of ethanoic acid (CH3COOH) in 75 g of benzene
Calculate molality of 2.5 g of ethanoic acid (CH3COOH) in 75 g of benzene
Calculate the molarity of a solution containing 5 g of NaOH in 450 mL solution
Calculate the molarity of a solution containing 5 g of NaOH in 450 mL solution
Calculate the mole fraction of ethylene glycol (C2H6O2) in a solution containing 20% of C2H6O2 by mass
Calculate the mole fraction of ethylene glycol (C2H6O2) in a solution containing 20% of C2H6O2 by mass
How many Type of Solution exist , please describe
How many Type of Solution exist , please describe
What is Solvent and Solute, please explain?
What is Solvent and Solute, please explain?
What is Solution , please explain?
What is Solution , please explain?
Silver forms ccp lattice and X-ray studies of its crystals show that the edge length of its unit cell is 408.6 pm. Calculate the density of silver (Atomic mass = 107.9 u).
Silver forms ccp lattice and X-ray studies of its crystals show that theedge length of its unit cell is 408.6 pm. Calculate the density of silver (Atomic mass = 107.9 u).
X-ray diffraction studies show that copper crystallises in an fcc unit cell with cell edge of 3.608×10-8 cm. In a separate experiment, copper is determined to have a density of 8.92 g/cm3, calculate the atomic mass of copper
X-ray diffraction studies show that copper crystallises in an fcc unit cell with cell edge of 3.608×10-8 cm. In a separate experiment, copper is determined to have a density of 8.92 g/cm3, calculate the atomic mass of copper
An element has a body-centred cubic (bcc) structure with a cell edge of 288 pm. The density of the element is 7.2 g/cm3. How many atoms are present in 208 g of the element?
An element has a body-centred cubic (bcc) structure with a cell edge of 288 pm. The density of the element is 7.2 g/cm3. How many atoms are present in 208 g of the element?
What is Packing Efficiency?
What is Packing Efficiency?Explian
Atoms of element B form hcp lattice and those of the element A occupy 2/3rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?
Atoms of element B form hcp lattice and those of the element A occupy 2/3rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?
A compound is formed by two elements X and Y. Atoms of the element Y (as anions) make ccp and those of the element X (as cations) occupy all the octahedral voids. What is the formula of the compound?
A compound is formed by two elements X and Y. Atoms of the elementY (as anions) make ccp and those of the element X (as cations) occupy all the octahedral voids. What is the formula of the compound?
What is Close Packed Structures please explain ?
What is Close Packed Structures please explain ?
What is FaceCentred Cubic Unit Cell
What is FaceCentred Cubic Unit Cell
What is BodyCentred Cubic Unit Cell
What is BodyCentred Cubic Unit Cell
What is Primitive Cubic Unit Cell ?
What is Primitive Cubic Unit Cell ?
Explain different properties of Metallic Solids,Molecular solids, Ionic solids and Covalent
Explain different properties of Metallic Solids,Molecular solids, Ionic solids and Covalent
Explain Covalent or Network Solids
Explain Covalent or Network Solids
Explain Metallic Solids
Explain Metallic Solids
Explain Ionic Solids
Explain Ionic Solids
Explain Molecular Solids
Explain Molecular Solids
Classification of Crystalline Solids
Classification of Crystalline Solids
What is Difference Between Amorphous and Crystalline Solids ?
What is the Difference Between Amorphous and Crystalline Solids?
What is Amorphous and Crystalline Solids
What is Amorphous and Crystalline Solids
Describe the General Characteristics of Solid State
Describe the General Characteristics of Solid State
What is the role of depressant in froth floatation process?
What is the role of depressant in froth floatation process?
Copper can be extracted by hydrometallurgy but not zinc. Explain.
Copper can be extracted by hydrometallurgy but not zinc. Explain.
WHAT IS Zone refining METHOD/TECHNIQUE TO REFINE METAL
WHAT IS Zone refining METHOD/TECHNIQUE TO REFINE METAL
WHAT IS Electrolytic refining METHOD/TECHNIQUE TO REFINE METAL
WHAT IS Electrolytic refining METHOD/TECHNIQUE TO REFINE METAL
WHAT IS Liquation METHOD/TECHNIQUE TO REFINE METAL
WHAT IS Liquation METHOD/TECHNIQUE TO REFINE METAL
What is Distillation method/technique to Refine Metal
What is Distillation method/technique to Refine Metal
At a site, low grade copper ores are available and zinc and iron scraps are also available. Which of the two scraps would be more suitable for reducing the leached copper ore and why?
At a site, low grade copper ores are available and zinc and iron scraps are also available. Which of the two scraps would be more suitable for reducing the leached copper ore and why?
Why is the reduction of a metal oxide easier if the metal formed is in liquid state at the temperature of reduction?
Why is the reduction of a metal oxide easier if the metal formed is in liquid state at the temperature of reduction?
Although thermodynamically feasible, in practice, magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Why ?
Although thermodynamically feasible, in practice, magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Why ?
Suggest a condition under which magnesium could reduce alumina
Suggest a condition under which magnesium could reduce alumina
what is Limitations of Ellingham Diagram
what is Limitations of Ellingham Diagram
Explain Ellingham Diagram
Explain Ellingham Diagram
EXPLAIN Froth Floatation Method FOR CONCENTRATION OF ORES .
EXPLAIN Froth Floatation Method FOR CONCENTRATION OF ORES .
EXPLAIN Magnetic Separation PROCESS FOR CONCENTRATION OF ORES .
EXPLAIN Magnetic Separation PROCESS FOR CONCENTRATION OF ORES .
Explain Hydraulic Washing process for Concentration of Ores .
Explain Hydraulic Washing process for Concentration of Ores .
What is the Concentration of Ores of Ores
What is the Concentration of Ores of Ores
Please let me know the Principal Ores of Some Important Metals
SOne please let me know the Principal Ores of Some Important Metals
400 ml of a gas at 227o C is to be reduced to a volume of 300 ml. By what degrees Celsius, must the temperature be altered keeping pressure constant.
A 200 mL of solution of I2 is divided into two unequal parts. I part reacts with hypo solution in acidic medium, 30 ml of 0.2 M hypo was consumed, II part was added with 50 mL of 0.6 M NaOH solution. What was the initial concentration of I2.
A 200 mL of solution of I2 is divided into two unequal parts. I part reacts with hypo solution in acidic medium, 30 ml of 0.2 M hypo was consumed, II part was added with 50 mL of 0.6 M NaOH solution. What was the initial concentration of I2.
The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. Its coordination number is?
The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. Its coordination number is?
A cubic unit cell has one atom on each corner and one atom on each body diagonal. The number of atoms in the unit cell is ?
A cubic unit cell has one atom on each corner and one atom on each body diagonal. The number of atoms in the unit cell is ?
Crystal systems in which no two axial lengths are equal are?
Crystal systems in which no two axial lengths are equal are?
Nitrogen exit as N2 but phosphorus exit as P4 why?
Nitrogen exit as 
but phosphorus exit as 
why?
Name the crystal defect which lowers the density of an ionic crystal .
The total number of neutrons present in 108 ml H2O(l)?
The total number of neutrons present in 108 ml H2O(l)?
How many half-lives should eclapse for a 1st order reaction A → products so that the reaction is atleast 95% completed?
How many half-lives should eclapse for a 1st order reaction A → products so that the reaction is atleast 95% completed?
a) 4
b) 5
c) 6
d) 7
What will be the order of reaction when concentration is very high and very low?
The rate of a certain reaction depends on concentration according to the equation :
What will be the order of reaction, when concentration (C) :
a) very-very high
b) very-very low
The average kinetic energy associated with one mole of gas is?
The average kinetic energy associated with one mole of gas is?
Why the HgO decomposes into its constituent elements on heating ?
Why the HgO decomposes into its constituent elements on heating ?
Name of one chloride which is soluble in hot water as well as in excess of HCl.
Name of one chloride which is soluble in hot water as well as in excess of HCl.
Why are amorphous solids isotropic in nature?
Two fast moving particles X and Y are associated with deBroglie wavelengths 1 nm and 4 nm respectively. If mass ofX is nine times the mass of Y, the ratio of kinetic energies ofX and Y would be
Two fast moving particles X and Y are associated with deBroglie wavelengths 1 nm and 4 nm respectively. If mass ofX is nine times the mass of Y, the ratio of kinetic energies ofX and Y would be
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?
How many P–H and O–H bonds respectively, are present in H4 P2O7 molecule?
How many P–H and O–H bonds respectively, are present in 
molecule?
How many molecules of O2 are present in 1.00L of O2 at STP?
How many molecules of O2 are present in 1.00L of O2 at STP?
What volume of O2 measured at 1.86 ×× 106Pa and 375k, is required to react entirely with 1.78l of H2, measured at the same temperature and pressure, to give H2O?
What volume of O2 measured at 1.86 ×× 106Pa and 375k, is required to react entirely with 1.78l of H2, measured at the same temperature and pressure, to give H2O?
What is the Methods of Preparation of Alcohols?
What is the Methods of Preparation of Alcohols?
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 :
- Nuclear charge and electron affinity
- Ionization energy and electron affinity
- Atomic radius and electron affinity
- None of above.
The helical structure of proteins is stabilized by?
The helical structure of proteins is stabilized by?
what is Moissan boron ?
what is Moissan boron ?
A fire of lithium, sodium and potassium can be extinguished by?
A fire of lithium, sodium and potassium can be extinguished by?
The reason for double helical structure of DNA is operation of?
The reason for double helical structure of DNA is operation of?
Why RNA is different from DNA?
Why RNA is different from DNA?
Which of the following liquid pairs shows a positive deviation from Raoult’s law?
Which of the following liquid pairs shows a positive deviation from Raoult’s law?
(a) Water hydrochloric acid
(b) Benzene methanol
(c) Water nitric acid
(d) Acetone chloroform.
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?
(a) LiCl
(b) NaCl
(c) KCl
(d) RbCl
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?
if gamma ray emission from a nucleus then what will be the number of nutron and proton?
if gamma ray emission from a nucleus then what will be the number of nutron and proton?
The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to I/8. The thickness of lead which will reduce the intensity to I/2 will be?
The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to I/8. The thickness of lead which will reduce the intensity to I/2 will be?
A radioactive sample at any instant has its disintegration rate 5000 disintegrations per minute.After 5 minutes, the rate is 1250 disintegrations per minute. Then, the decay constant (per minute) is?
A radioactive sample at any instant has its disintegration rate 5000 disintegrations per minute.After 5 minutes, the rate is 1250 disintegrations per minute. Then, the decay constant (per minute) is?
If N0 is the original mass of the substance of half life period t1/2 = 5 years, then the amount of substance left after 15 years is?
If N0 is the original mass of the substance of half life period t1/2 = 5 years, then the amount of substance left after 15 years is?
What amount of CaO is produced by 1g of calcium?
What amount of CaO is produced by 1g of calcium?
Calculate the volume of CO2 obtained at STP when 3.5 g of K2CO3 reacts with excess of dil HCl?
Calculate the volume of CO2 obtained at STP when 3.5 g of K2CO3 reacts with excess of dil HCl?
write the strurture of 3- oxopentanal
Why does the potential of a mercury cell remain constant?
Why does the potential of a mercury cell remain constant?
Write the equations of the reactions involved at each electrode in a H2 – O2 fuel cell.
Write the equations of the reactions involved at each electrode in a 
fuel cell.
What type of bonding helps in stabilising the alpha-helix structure of proteins? Explain
What type of bonding helps in stabilising the 
structure of proteins? Explain
What are the four main types of forces?
What are the four main types of forces?
What is the stress and strain?
What is the stress and strain?
Is elastic potential energy always positive?
Is elastic potential energy always positive?
What is K in 1 2kx 2?
What is K in 1 2kx 2?
What is elastic potential energy formula?
What is elastic potential energy formula?
What is the meaning of restoring force?
What is the meaning of restoring force?
How do you find the spring constant?
How do you find the spring constant?
What is the formula for spring constant?
What is the formula for spring constant?
What is the formula for energy?
What is the formula for energy?
What is the formula of work done?
What is the formula of work done?
What are the units of the Hooke's law constant k?
What are the units of the Hooke's law constant k?
What does Hooke's law tell us?
What does Hooke's law tell us?
Why is there a negative sign in F KX?
Why is there a negative sign in F KX?
What does the K stand for in F KX?
What does the K stand for in F KX?
Why the slowest step is the rate determining step?
Why the slowest step is the rate determining step?
What is the rate law of a reaction?
What is the rate law of a reaction?
What does it mean for a reaction to be first order?
What does it mean for a reaction to be first order?
What is the first order reaction?
What is the first order reaction?
What does it mean to be a second order reaction?
What does it mean to be a second order reaction?
What does it mean if a reaction is zero order?
What does it mean if a reaction is zero order?
How do you determine the rate determining step?
How do you determine the rate determining step?
What is the steady state approximation?
What is the steady state approximation?
What is an intermediate in chemistry?
What is an intermediate in chemistry?
What is the elementary step of a reaction?
What is the elementary step of a reaction?
What do you mean by zero order reaction?
What do you mean by zero order reaction?
What is the overall order of the reaction?
What is the overall order of the reaction?
How do you measure the rate of an enzyme reaction?
How do you measure the rate of an enzyme reaction?
What are the 4 factors that affect the rate of a chemical reaction?
What are the 4 factors that affect the rate of a chemical reaction?
What is the principle of Le Chatelier?
How do I go from Ka to PKA?
How do I go from Ka to PKA?
How do you determine the PKA?
How do you determine the PKA?
What is the Henderson Hasselbalch equation?
What is the Henderson Hasselbalch equation?
What is KSP equilibrium?
What is KSP equilibrium?
Is PH and PKA the same thing?
Is PH and PKA the same thing?
How do you find the PKA from the PH?
How do you find the PKA from the PH?
How is PKA related to PH?
How is PKA related to PH?
How do you find the ph of a solution?
How do you find the ph of a solution?
What is a third order reaction?
What is a third order reaction?
How can reaction rate be determined?
How can reaction rate be determined?
What is a rate law in chemistry?
What is a rate law in chemistry?
How do you determine a rate law?
How do you determine a rate law?
How do you measure the rate of a chemical reaction?
How do you measure the rate of a chemical reaction?
What is the collision theory in chemistry?
What is the collision theory in chemistry?
What is r in chemistry?
What is r in chemistry?
Is it okay to take potassium supplements?
Is it okay to take potassium supplements?
What is the difference between potassium and vitamin K?
What is the difference between potassium and vitamin K?
How is an equilibrium reached?
How is an equilibrium reached?
How do Increases in temperature affect the rate of reaction?
How do Increases in temperature affect the rate of reaction?
When Q is less than K?
When Q is less than K?
What is the relationship between G and K?
What is the relationship between G and K?
What is meant by the rate of a reaction?
What is meant by the rate of a reaction?
Are KC and KEQ the same thing?
Are KC and KEQ the same thing?
Can KEQ be greater than 1?
Can KEQ be greater than 1?
What does a small KEQ value mean?
What does a small KEQ value mean?
What does it mean when the products are favored?
What does it mean when the products are favored?
How do you calculate equilibrium constant?
How do you calculate equilibrium constant?
What is the equilibrium equation?
What is the equilibrium equation?
What is the equation for KEQ?
What is the equation for KEQ?
What is KSP chemistry?
What is KSP chemistry?
How do you find the ph of a solution?
How do you find the ph of a solution?
What is W W in chemistry?
What is W W in chemistry?
What does wt% mean in chemistry?
What does wt% mean in chemistry?
What is K in 1 2kx 2?
What is K in 1 2kx 2?
What does F =- KX stand for?
What does F =- KX stand for?
What is the rate determining step of a reaction?
What is the rate determining step of a reaction?
What do you mean by zero order reaction?
What do you mean by zero order reaction?
What is a third order reaction?
What is a third order reaction?
What is the elementary step of a reaction?
What is the elementary step of a reaction?
What is the overall order of the reaction?
What is the overall order of the reaction?
What is the definition of rate of reaction?
What is the definition of rate of reaction?
What is the Henderson Hasselbalch equation?
What is the Henderson Hasselbalch equation?
What is KSP chemistry?
What is KSP chemistry?
What is the difference between PKA and PH?
What is the difference between PKA and PH?
How do you determine a rate law?
How do you determine a rate law?
What is a chemical kinetics?
What is a chemical kinetics?
What is the KC in chemistry?
What is the KC in chemistry?
Is potassium and vitamin K the same thing?
Is potassium and vitamin K the same thing?
When KEQ is less than 1?
When KEQ is less than 1?
What does a small KEQ value mean?
What does a small KEQ value mean?
Is KEQ products over reactants?
Is KEQ products over reactants?
What is the equation for Ka?
What is the equation for Ka?
What does W stand for in chemistry?
What does W stand for in chemistry?
What is the Q in chemistry?
What is the Q in chemistry?
What is spring force?
What is spring force?
What is K in elastic potential energy formula?
What is K in elastic potential energy formula?
What is the formula for spring constant?
What is the formula for spring constant?
What is a rate law in chemistry?
What is a rate law in chemistry?
What is the Ka in chemistry?
What is the Ka in chemistry?
In chemical kinetics a reaction rate constant or reaction rate coefficient, k, quantifies the rate of a chemical reaction. ... Here k(T) is the reaction rate constant that depends on temperature.
In chemical kinetics a reaction rate constant or reaction rate coefficient, k, quantifies the rate of a chemical reaction. ... Here k(T) is the reaction rate constant that depends on temperature.
Potassium. The name is derived from the english word potash. The chemical symbol K comes from kalium, the Mediaeval Latin for potash, which may have derived from the arabic word qali, meaning alkali. Potassium is a soft, silvery-white metal, member of the alkali group of the periodic chart.
What is the equation for KEQ?
What is the equation for KEQ?
Equilibrium: Q and K. Consider a simple chemical system including just two compounds, A and B: ... K is the numerical value of Q at the "end" of the reaction, when equilibrium is reached.
Equilibrium: Q and K. Consider a simple chemical system including just two compounds, A and B: ... K is the numerical value of Q at the "end" of the reaction, when equilibrium is reached.
What is K in chemistry?
What is K in chemistry?
Solid state
Why is frenkel defect not found in pure alkali metal halides
Based on the statements given here choose the correct answer.
Based on the statements given here choose the correct answer.
P.Gases can be cooled and converted into liquid below its critical temperature by increasing the pressure on it.
Q.Above the critical temperature, a gas (vapour) can not be liquefied however great the pressure it is subjected to
(A)Both P and Q are true and Q explain P
(B)Both P and Q are the true but Q cannot explains P
(C)Only P is true
(D)Q is true
Which will form unipositive ion with atomic no. 12,13,14,15
Atoms
The synthesis of alkyl fluorides is best accomplished by?
The synthesis of alkyl fluorides is best accomplished by?
Define the term tyndall effect
Chemistry
What is Packing Efficiency ?
Describe Packing Efficiency
Define Fcentre. Mention its one consequence.
What is F Centre
Examples of ionic bonds?
What are some examples of ionic bonds?
Three main properties of ionic compounds?
What are the three main properties of ionic compounds?
Characteristics of an ionic bond?
What are the characteristics of an ionic bond?
Are ionic bonds good insulators?
Are ionic bonds good insulators?
Is h20 an ionic compound?
Is h20 an ionic compound?
What is the difference between covalent and ionic bonding?
What is the difference between covalent and ionic bonding?
Which one is the strongest bond?
Which one is the strongest bond?
Are ionic or covalent bonds stronger?
Are ionic or covalent bonds stronger?
What is the weakest type of bond?
What is the weakest type of bond?
How would you describe the electrical charge of an ionic compound?
How would you describe the electrical charge of an ionic compound?
Which is an example of a metallic bond?
Which is an example of a metallic bond?
Why is the melting point of magnesium oxide is much higher than sodium chloride?
Why is the melting point of magnesium oxide is much higher than sodium chloride?
Why are ionic solids poor conductors of electricity?
Why are ionic solids poor conductors of electricity?
Do ionic solids have high melting points?
Do ionic solids have high melting points?
Six properties of ionic compounds?
What are the six properties of ionic compounds?
Are covalent bonds hard and brittle?
Are covalent bonds hard and brittle?
Why ionic compounds are solid?
Why ionic compounds are solid?
Why are ionic bonds so strong?
Why are ionic bonds so strong?
Are ionic solids brittle?
Are ionic solids brittle?
Why ionic solids are highly brittle?
Why ionic solids are highly brittle?
Why do ionic compounds tend to be hard and brittle?
Why do ionic compounds tend to be hard and brittle?
Reason of Ionic solids are hard and brittle
What isReason of Ionic solids are hard and brittle ?
Distinctions between crystalline and amorphous solids with one example of each.
What is Difference between crystalline and amorphous solids with one example of each.
Give the significance of a lattice point.
Give the significance of a lattice point.
What type of solids are electrical conductors, malleable and ductile?
What type of solids are electrical conductors, malleable and ductile?
What is Amorphous solids ?expain
What is Amorphous solids ?
WHat is Crystalline solids ? Expain
WHat is Crystalline solids ?
Why do solids have a definite volume?
Why do solids have a definite volume?
Why are solids rigid?
Why are solids rigid?
Why is glass considered a super cooled liquid?
Why is glass considered a super cooled liquid?
Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show cleavage property?
Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show cleavage property?
Classify the following solids in different categories based on the nature of intermolecular forces operating in them: Potassium sulphate, tin, benzene, urea, ammonia, water, zinc sulphide, graphite, rubidium, argon, silicon carbide.
Classify the following solids in different categories based on the nature of intermolecular forces operating in them: Potassium sulphate, tin, benzene, urea, ammonia, water, zinc sulphide, graphite, rubidium, argon, silicon carbide.
Solid A is very hard, electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?
Solid A is very hard, electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?
In a p-type semiconductor the current is said to move through holes.
In a p-type semiconductor the current is said to move through holes.Explain.
Explain Metal Deficiency Defects
What is Metal Deficiency Defects ?
Explain Metal Excess Defects
What is Metal Excess Defects?
Expalin Non – Stoichiometric Defects
What is Non – Stoichiometric Defects ?
Expian Interstitial Defect
What is Interstitial Defect ?
Explain Vacancy Defect
What is Vacancy Defect ?
Explain Stoichiometry Defects
What is Stoichiometry Defects ?
Expain Atomic Imperfections or Point Defects
What is Atomic Imperfections or Point Defects ?
Expain H-center defects
What is H-center defects ?
Explain F-center defects
What is F-center defects
Explain The Frenkel Defect
The Frenkel Defect
The Schottky Defect
Explain The Schottky Defect
Which type of defects are known as thermodynamic defects?
Which type of defects are known as thermodynamic defects?
Name one solid in which both Frenkel and Schottky defects occur.
Name one solid in which both Frenkel and Schottky defects occur.
Why is Br(V) a stronger oxidant than Sb (V)?
Why is Br(V) a stronger oxidant than Sb (V)?
hy is the froth flotation method selected for the concentration of sulphide ores
hy is the froth flotation method selected for the concentration of sulphide ores
Define the term ‘Tyndall effect’.
Define the term ‘Tyndall effect’.
Which point defect in ionic crystal does not alter the density of the relevant solid?
Which point defect in ionic crystal does not alter the density of the relevant solid?
What makes the crystal of KCl sometimes appear violet?
What makes the crystal of KCl sometimes appear violet?
Name the crystal defect which lowers the density of an ionic crystal.
Name the crystal defect which lowers the density of an ionic crystal.
Why does conductivity of silicon increase with the rise in temperature
Why does conductivity of silicon increase with the rise in temperature
What is ‘doping’ ?
What is ‘doping’ ?
Which point defect is observed in a crystal when a vacancy is created by an atom missing from a lattice site.
Which point defect is observed in a crystal when a vacancy is created by an atom missing from a lattice site.
Why is Frenkel defect not found in pure alkali metal halides?
Why is Frenkel defect not found in pure alkali metal halides?
In Corundum, O2– ions from hcp and Al3+ occupy two third of octahedral voids. Determine the formula of corundum
In Corundum, O2– ions from hcp and Al3+ occupy two third of octahedral voids. Determine the formula of corundum.
In NaCl crystal, Cl– ions form the cubic close packing. What sites are occupied by Na+ ions.
In NaCl crystal, Cl– ions form the cubic close packing. What sites are occupied by Na+ ions.
An element crystallises separately both in hcp and ccp structure. Will the two structures have the same density? Justify your answer
An element crystallises separately both in hcp and ccp structure. Will the two structures have the same density? Justify your answer
How much space is empty in a hexagonal closed packed solid?
How much space is empty in a hexagonal closed packed solid?
Arrange simple cubic, bcc and fcc lattice in decreasing order of the fraction of the unoccupied space.
Arrange simple cubic, bcc and fcc lattice in decreasing order of the fractionof the unoccupied space.
How many octahedral voids are there in 1 mole of a compound having cubic closed packed structure?
How many octahedral voids are there in 1 mole of a compound having cubic closed packed structure?
What is the coordination number for (a) an octahedral void (b) a tetrahedral void.
What is the coordination number for (a) an octahedral void (b) a tetrahedral void.
If the formula of a compound is A2B, which sites would be occupied by A ions?
If the formula of a compound is A2B, which sites would be occupied by A ions?
What type of stoichiometric defect is shown by: (i) ZnS (ii) AgBr
What type of stoichiometric defect is shown by: (i) ZnS (ii) AgBr
what is voids in chemistry
what is voids in chemistry
Define the term 'crystal lattice.’
Define the term 'crystal lattice.’
Why glass is regarded as an amorphous solid?
Why glass is regarded as an amorphous solid?
Why are amorphous solids isotropic in nature?
Why are amorphous solids isotropic in nature?
What are anisotropic substances?
What are anisotropic substances?
A drop of food coloring spreading out in a cup of water is an example of which transport process?
A drop of food coloring spreading out in a cup of water is an example of which transport process?
Where in the body is most of the iron located?
Where in the body is most of the iron located?
What is Shape of Liquid?
What is Shape of Liquid?
symbol Ag stands for which element?
symbol Ag stands for which element?
What all organic molecules contain?
What all organic molecules contain?
Who is invented the modern periodic table?
Who is invented the modern periodic table?
What is the most common isotope of hydrogen?
What is the most common isotope of hydrogen?
Noble gases are inert because they have completed outer electron shells. Which of these elements isn't a noble gas?
Noble gases are inert because they have completed outer electron shells. Which of these elements isn't a noble gas?
DNA codes for proteins, which are the building blocks of organisms. What is the most abundant protein in the human body?
DNA codes for proteins, which are the building blocks of organisms. What is the most abundant protein in the human body?
Water-based liquids can be described as acidic, neutral, or basic, with respect to pH. Which of these describes milk?
Water-based liquids can be described as acidic, neutral, or basic, with respect to pH. Which of these describes milk?
symbol Sb stands for stibnum or stibnite. What is the modern name of this element?
symbol Sb stands for stibnum or stibnite. What is the modern name of this element?
How much salt (NaCl) is in the average adult human body?
How much salt (NaCl) is in the average adult human body? as it's very essential minerals in the human body.
Describe the mechanism of the formation of ethene from ethanol in the presence of concentrated sulphuric acid.
Describe the mechanism of the formation of ethene from ethanol in the presence of concentrated sulphuric
acid.
A compound contains two type of atoms A and B. It crystalises in a cubic lattice with atom A at the corners of the cube and atom B at the face centres. What is the simplest formula of the compound?
A compound contains two type of atoms A and B. It crystalises in a cubic lattice with atom A at the corners of the cube and atom B at the face centres. What is the simplest formula of the compound?
In Dumas' method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be (Aqueous tension at 300 K = 15 mm) ?
In Dumas' method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be (Aqueous tension at 300 K = 15 mm) ?
By what factors does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?
By what factors does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?
The total number of atomic orbitals in fourth energy level of an atom is?
The total number of atomic orbitals in fourth energy level of an atom is ?
The species, having bond angles of 120° is?
The species, having bond angles of 120° is?
The colour of the X2 molecules of group 17 elements changes gradually from yellow to violet down the group. This is due to?
The colour of the X2 molecules of group 17 elements changes gradually from yellow to violet down the
group. This is due to
[A] the physical state of X2 at atom temperature changes from gas to solid down the group
[B] decrease in HOMO-LUMO gap down the group
[C] decrease in 
gap down the group
[D] decrease in ionization energy down the group
Name 3 isostructural molecules?
Name 3 isostructural molecules
What is Thiol group?
Thiol group is present in :
(1) Cystine
(2) Cysteine
(3) Methionine
(4) Cytosine
what is isoelectronic species?
What is isoelectronic species?
Please explain?
The formation of which of the following polymers involves hydrolysis reaction?
The formation of which of the following polymers involves hydrolysis reaction?
(1) Bakelite
(2) Nylon 6, 6
(3) Terylene
(4) Nylon 6
what is Ph value of water.?
what is Ph value of water.?
The number of types of bonds between two carbon atoms in calcium carbide is?
The number of types of bonds between two carbon atoms in calcium carbide is?
The carbon–based reduction method is NOT used for the extraction of?
The carbon–based reduction method is NOT used for the extraction of:
a. tin from