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

(1) 0.5

(2) 0.1

(3) 2

(4) 3

The relative lowering of vapour pressure caused by dissolving 71.3g of a substance in 1000g of water is 7.13 X 10^-3. The molecular mass of the substance is:

The total vapour pressure of a mixture of 1mol $\mathrm{A}\left({\mathrm{P}}_{\mathrm{A}}^0=150 \mathrm{torr}\right)$ and 2 mol $\mathrm{B}\left({\mathrm{P}}_{\mathrm{B}}^0=240 \mathrm{torr}\right)$ 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 the above

One litre aqueous solution of sucrose (molar mass = 342 g/mol) weighing 1015 g is found to record an osmotic pressure of 4.82 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 Haff 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

Which of the following is dependent on temperature?

(1) Molality
(2) Molarity
(3) Mole fraction
(4) Weight percentage

Ionic mobility of which of the following alkali metal ions is lowest when an aqueous solution of their salts are put under an electric field?

(1) Na                       

(2) K

(3) Rb                       

(4) Li

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 electrolytes 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]