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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A 0.002 molar solution of NaCl having degree of dissociation of 90% at 27$°\mathrm{C}$, has osmotic pressure equal to :-

(1) 0.94 bar

(2) 9.4 bar

(3) 0.094 bar

(4) 9.4 X 10-4 bar

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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

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Total vapour pressure of mixture of 1mol  and 2 mol  is 200 torr. In this case:

(1) there is positive deviation from Raoult's law

(2) there is negative deviation from Raoult's law

(3) there is no deviation from Raoult's law

(4) none of those

Concept Questions :-

Relative Lowering of Vapour Pressure/ Vapour Pressure
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When 0.1 m CH3COOH is present in a solvent it shows elevation in boiling point of 0.75$°\mathrm{C}$. Acid dissociation constant will be -(Kb=5 K Kg mol-1) (1M =1m)

(1) 5 X 10-2

(2) 5 X 10-3

(3) 10-2

(4) 10-3

Concept Questions :-

Elevation of Boiling Point