The van't Hoff factor of a 0.005 M aqueous solution of KCl is 1.95. The degree of ionisation of KCl is-
1. 0.95
2. 0.97
3. 0.94
4. 0.96
Compound PdCl4.6H2O is a hydrated complex, 1 molal aqueous solution of it has freezing point 269.28 K. Assuming 100 % ionization of complex, the molecular formula of the complex is-
(Kf for water = 1.86 K kg mole-1)
1. [Pd(H2O)6]Cl4
2. [Pd(H2O)4Cl2]Cl2.2H2O
3. [Pd(H2O)3Cl3]Cl.3H2O
4. [Pd(H2O)Cl4]4H2O
The temperature dependent term among the following is -
1. | Molality | 2. | Molarity |
3. | Mole fraction | 4. | Weight percentage |
A solution of sucrose (molar mass = 342 g mol-1) has been prepared by dissolving 68.5 g of sucrose in 1000 g of water.
The freezing point of the solution obtained will be:
(Kf for water = 1.86 K kg mol-1)
1. -0.372 C
2. 0.372 C
3. 0.572 C
4. -0.572 C
If partial pressure of oxygen is 0.5 atm and KH = 1.4 × 10-3 M/atm, then the amount of oxygen dissolved in 100 ml water at 298K is-
1. | 22.4 mg | 2. | 22.4 g |
3. | 2.24 g | 4. | 2.24 mg |
Total vapour pressure of a mixture of 1 mol A (pA° = 150 torr) and 2 mol B ( = 240 torr) is 200 torr. In this case:-
1. There is a positive deviation from Raoult's law
2. There is a negative deviation from Raoult's law
3. There is no deviation from Raoult's law
4. None of these
The relative lowering of vapour caused by dissolving 71.3 g of a substance in 1000 g of water is 7.13 x 10-3. The molecular mass of the substance is-
1. 180 g mol-1
2. 18 g mol-1
3. 1.8 g mol-1
4. 360 g mol-1
A solution of acetone in ethanol:
1. Shows a negative deviation from Raoult's law.
2. Shows a positive deviation from Raoult's law.
3. Behaves like a near ideal solution.
4. Obeys Raoult's law.
The density of H2SO4 solution is 1.84 g ml–1. In a 1 litre solution if H2SO4 is 93 % by (w/v) then the molality of the solution is -
1. | 9.42 m | 2. | 10.42 m |
3. | 11.42 m | 4. | 12.42 m |
Lowering in vapour pressure is the highest for:
1. 0.2 m urea
2. 0.1 m glucose
3. 0.1 m MgSO4
4. 0.1 m BaCl2