What is the vapour pressure of a solution when the mole fraction of water is 0.9, assuming the vapor pressure of pure water is 30 mm Hg at room temperature?

1. 30 mm of Hg

2. 24 mm of Hg

3. 21 mm of Hg

4. 27 mm of Hg

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

The solution having highest vapour pressure is (Assume 100% ionisation of electrolytes)

1. 1 N KNO₃

2. 1 N Ba(NO₃)₂

3. 1 N Al₂(SO₄)₃

4. 1 N Th(NO₃)₄

K₄[Fe(CN)₆] is 60% ionised. Then the value of Van't Hoff factor is

1. 1.6

2. 2.4

3. 3

4. 3.4

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-

(K_f 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

In a cold climate frozen causing damage to radiator of a car. Ethylene glycol is used as antifreezing agent. The amount of ethylene glycol to be added to 4 kg of water to prevent it from freezing at $-6°C$. $[k_f for water=1.85 k kg mo{l}^{-1}]$

1. 204.22 g

2. 804.32 g

3. 602 gm

4. 401 gm

If molality of the dilute solution is doubled, the value of molal depression constant (K_f) will be?

(1) doubled

(2) halved

(3) tripled

(4) unchanged

The temperature dependent term among the following is -

The van't Hoff factor [i] for a dilute aqueous solution of the strong electrolyte barium hydroxide is?

(1) 0

(2) 1

(3) 2

(4) 3

Which one of the following is incorrect for ideal solution ?

(1) $∆{\mathrm{H}}_{\mathrm{mix}}=0$

(2) $∆{\mathrm{U}}_{\mathrm{mix}}=0$

(3) $∆\mathrm{P}={\mathrm{P}}_{\mathrm{obs}}-{\mathrm{P}}_{\mathrm{calculated} \mathrm{by} \mathrm{Raoul}\text{'}\mathrm{s} \mathrm{law}} = 0$

(4) $∆{\mathrm{G}}_{\mathrm{mix}}=0$