The total vapour pressure of a mixture of 1 mole A \(\left(\mathrm{p}_{\mathrm{A}}^{\circ}=150 \text { torr }\right)\) and 2 mole B \(\left(\mathrm{p}_{\mathrm{B}}^{\circ}=240 \text { torr }\right)\) is 200 mm.
Mark the correct statement that is associated with it:

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 the above.

One litre aqueous solution of sucrose (molar mass = 342 g/mol) weighing 1015 g is found to record an osmotic pressure of 4.8 atm at 293K. What is the molality of the sucrose solution ? (R= 0.0821 L atm K^-1 mol^-1) :

(1) 0.84

(2) 0.21

(3) 0.42

(4) 0.63

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

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

The relative lowering of vapour pressure 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

(2) 18

(3) 1.8

(4) 360

20g of naphthoic acid (C₁₁H₈O₂) dissolved in 50g of benzene (K_f=1.72 K Kg mol^-1) shows a depression in freezing point of 2K. The Vant Hoff factor is?

1. 0.5

2. 0.1

3. 2

4. 3

The boiling point of an azeotropic mixture of water and ethanol is less than that of water and ethanol. The mixture shows

(1) No deviation from Raoult's law

(2) Positive deviation from Raoult's law

(3) Negative deviation from Raoult's law

(4) That the solution is unsaturated

The temperature dependent term among the following is -

Which one is not equal to zero for an ideal solution?

1. ΔH_mix 

2. ΔS_mix

3. ΔV_mix

4. ΔP=P_Observed-P_Raoult

Which one of the following elctrolytes has the same value of van't Hoff's factor(i) as

that of Al₂(SO₄)₃  (if all are 100% ionised)? 

1. K₂SO₄

2. K₃[Fe(CN)₆]

3. Al(NO₃)₃

4. K₄[Fe(CN)₆]