In closest packing of A type of atoms (radius, rA), the radius of atom B that can be fitted into Octahedral void is
The arrangement of Cl- ions in CsCl structure is
Xenon crystallizes in face centre cubic lattice and the edge of the unit cell is 620 pm, then the radius of xenon-atom is.
if the ratio of co-ordination no. P to that of Q be Y:Z, then the formula of the solid is
The limiting radius ratio of the complex
Compute the percentage void space per unit volume of unit cell in zinc-fluoride structure.
Prove that void space in fluorite structure per unit volume of unit cell is 0.251?
In a face centred lattice with all the positions occupied by A atoms the body centred octahedral hole in it is occupied by an atom B of an appropriate size for such a crystal, calculate the void space per unit volume of unit cell. Also predict the formula of the compound?
A tube of uniform cross sectional area 1 cm2 is closed at one end with semi permiable membrane. A solution having 5 gm glucose per 100 ml is placed inside the tube and dipped in pure water at 27°C. When the equilibrium is established, what will be the osmotic pressure, height developed in vertical column. Also calculate molality and molarity of the solution. Density of glucose solution is 1 gm/ml
NaCl is added to 1 litre water to such an extent that
becomes to the wt. of NaCl added is
The vapour pressure of solvent is 20 torr, while that of its dilute solution is 17 torr, the mole-fraction of the solvent is
Which of the following plots represents the behaviour of an ideal binary liquid solution?
The vapour pressures of ethanol and methanol are 42.0 mm and 88.5 mm Hg respectively. An ideal solution is formed at the same temperature by mixing 46.0 g of ethanol with 16.0 g of methanol. The mole fraction of methanol in the vapour is:
The vapour pressure of benzene at 80°C is lowered by 10 mm by dissolving 2g of a non-volatile substance in 78g of benzene. The vapour pressure of pure benzene at 80°C is 750 mm. The molecular weight of the substance will be:
Solute A is a ternary electrolyte and solute B is non-electrolyte. If 0.1 M solution of solute B produces an osmotic pressure of 2P, then 0.05 M solution of A at the same temperature will produce on osmotic pressure equal to
A solution containing 8.6 g urea in one litre was found to be isotonic with a 5% (wt./vol.) solution of an organic non-volatile solute. The molecular weight of latter is:
Dry air was passed successively through a solution of 5 g of a solute in 180 g of water and then through pure water. The loss in weight of solution was 2.50 g and that of pure solvent 0.04 g. The molecular weight of the solute is:
Osmotic pressure of blood is 7.65 atm at 310 K. An aqueous solution of glucose that will be isotonic with blood is ----------- wt./vol.
One mole of non-volatile solute is dissolved in two moles of water. The vapour pressure of the solution relative to that of water is
A 0.1097 gm sample of As2O3 required 26.10 mL of KMnO4 solution for its titration. The molarity of KMnO4 solution is
The volume of 0.25 M H3PO3 required to neutralise 25 ml of 0.03 M Ca(OH)2 is
1.5 litre of a solution of normality N and 2.5 litre of 2M HCl are mixed together. The resultant solution had a normality 5. The value of N is
20g of sample of Ba(OH)2 is dissolved in 50 mL of 0.1 N HCl solution. The excess of HCl was titrated with 0.1 N NaOH. The volume of NaOH used was 20 ml. The percentage of Ba(OH)2 in the sample is
A metal oxide has the formula Z2O3. It can be reduced by hydrogen to give free metal and water. 0.1596g of the metal oxide requires 6 mg of hydrogen for complete reduction. The atomic weight of the metal is
When 0.1 mole of H3BO3 is titrated against NaOH of 1 M using phenolphthalein indicator what volume of NaOH is used up to the end point?
20 ml of a H3PO4 solution needs 40 ml of 0.1 M NaOH to convert it into sodium dihydrogen phosphate. How much volume of 0.1 M Ca(OH)2 is needed to neutralise the same volume of same H3PO4 completely
The equivalent weight of iron in 
would be
Two metallic oxides contain 27.6% and 30% oxygen respectively. If the formula of the first oxide is M3PO4, then that of the second will be
The equivalent weight of an element is 4. Its chloride has a vapour density 59.25. Then the valency of the element is
Although Aluminium is above hydrogen in the electrochemical series, it is stable in air and water. Explain.
In alkali metal group which is the strongest reducing agent and why?
Among fluorine – fluorine bond and chlorine – chlorine bond, which is more stronger and why?
NaOH behaves as a base while Zn(OH)2 is amphoteric why?
The electronegativity of H, N are 2.1, 3.0 respectively. Calculate percentage ionic character of H – N bond.
The electron affinity of sulfur is greater than oxygen. Why?
The vapour density of undecomposed N2O4 is 46. When heated, vapour density decreases to 24.5 due to its dissociation to NO2. The % dissociation of N2O4 at the final temperature is
For which of the following Kp may be equal to 0.5 atm
if pressure is applied to the following equilibrium, liquid -> vapours the boiling point of liquid
For the reaction
the forward reaction at constant temperatured is favoured by
In the system, LaCl3(s) + H2O (g)+heat ------------>. LaClO(s)+2HCl (g), equilibrium is established. More water vapour is added to reestablish the equilibrium. The pressure of water vapour is doubled. The factor by which pressure of HCl is changed is
For a reaction A(g) + B(g) ---------> C(g) + D(g), the initial concentration of A and B are equals but the equilibrium concentration of C is twice that of equilibrium concentration of A. Then K is
The partial pressure of CH3OH (g), CO(g) and H2(g) in equilibrium mixture for the reaction
CO(g) + 2H2(g) ----> CH3OH(g)
are 2.0, 1.0, and 0.1 atm respectively at 427°C. The value of Kp for decomposition of CH3OH to CO and H2 is
For reaction A(g) + B(g) -> AB(g)
we start with 2 moles of A and B each. At equilibrium 0.8 moles of AB is formed. Then how much of A changes to AB
The equilibrium constant for the reaction
In the presence of a catalyst the equilibrium is attained 10 times faster. Therefore the equilibirum constant in presence of the catalyst at 200 K is
In a reaction at equilibrium ‘X’ moles of the reactant A decomposes to give 1 mole each of C and D. If the fraction of A decomposed at equilibrium is independent of initial concentration of A then the value ‘X’ is
The degree of dissociation of PCl5 is 66%, then find out the observed molar mass of the mixture.
Calculate Kc for the reaction A(g) + 2B(g) 3C(g) when the reaction was started with 2 moles/litre of A and 3 moles/litre of B. The equilibrium concentration of C is 3 mole/litre.
Calculate pH of the following two solutions
-
i) 1 M CH3COOH, and
-
ii) 10–6M CH3COOH
Ka(CH3COOH) = 1.8 * 10–5
Velocity gradient has same dimensional formula as:
The dimensional formula of compressibility is :