40 g NaOH (i=2) is dissolved in 1L volatile solvent vapour pressure  of this solution becomes equal to its solid phase at 300K. What is the freezing point of pure solvent.

(Density = 1g/mL) (kf=1.8 k kgmol-1)

1. 296.4 K

2. 303.6 K 

3. 297.5 K

4. 302.4 K

Concept Questions :-

Depression of Freezing Point
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P1 and P2 are vapour pressure of solvent and solution at temperature T. The solution is prepared by dissolving non-volatile solute in the same solvent. P1 =760 torr, P2 =684 mm Hg, Mole fraction of solvent in the solution will be:-

(1) 0.1

(2) 0.2

(3) 0.9

(4) Can't be predicted

Concept Questions :-

Relative Lowering of Vapour Pressure/ Vapour Pressure
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100 g solute is dissolved in 1400 g of solvent. Density of resultant solution is 1.5 g/mL. The ratio of its molarity and molality will be :-
(1)1.5

(2) 1.3

(3) 1.4

(4) 1.2

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As scuba divers come towards water surface from underwater, solubility of gases in their blood :-
(1) Increases
(2) Decreases
(3) Firstly Increases then decrease
(4) Firstly Decreases then Increase

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Solution A & B are formed by dissolving certain amount of glucose and sucrose in water. Vapour pressure of these solutions is 660 and 560 mm Hg respectively. Ratio of molality of solutions A & B will be :-

(1) 14/33
(2) 33/14
(3) 15/35
(4) 35/15

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Saturated solution of Ag2SO4 shows 0.003K rise in boiling point, Ksp will be :(Kb = 5 K kg mol-1)(1m=1M)

1. 3.2 x 10-11

2.  3.2 x 10-10

3.  3.2 x 10-9

4.  3.2 x 10-12

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When 36 g of a solute having the empirical formula CH2O is dissolved in 1.2 kg of water, the solution freezes at
-0.93°C. What is the molecular formula of solute (K= 1.86 kg K mol-1)

(1) C2H4O

(2) C2H2O2
(3) C2H4O3

(4) C2H4O2

Concept Questions :-

Depression of Freezing Point
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6g urea is dissolved in 1kg solvent. Value of (T1-T2) will be : (Kf=2 kg K mol-1)

(1) 0.2°C
(2)-0.2°C
(3) 0.1°C
(4)-0.1 K

Concept Questions :-

Elevation of Boiling Point
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A solution containing 0.03659 g/ml of HCl and a solution containing 0.04509 g/ml of acetic acid Then:

(1) NHCl is more

(2)NCH3COOH is more

(3) Both have same normality

(4) None of these

Concept Questions :-

Concentration Term and Numericals
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The lubricating action of an oil is more if it possess:-

(1) High vapour pressure

(2) low vapour pressure

(3) High surface tension

(4) High density

Concept Questions :-

Relative Lowering of Vapour Pressure/ Vapour Pressure
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Difficulty Level: