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

(1) C2H4O

(2) C2H2O2

(3) C2H4O3

(4) C2H4O2

Concept Questions :-

Depression of Freezing Point
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How much oxygen is dissolved in 100ml water at 298K if partial pressure of oxygen is 0.5 atm and KH=1.4 X 10-3 M/atm ?

1. 22.4 mg

2. 22.4 g

3. 2.24 g

4. 2.24 mg

Concept Questions :-

Dalton’s Law of Partial Pressure/ Henry"s law
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A solute x when dissolved in solvent associates to form a pentamer. The value of van't hoff factor (i) for the solute will be:-

(1) 0.5

(2)  5

(3) 0.2

(4) 0.1

Concept Questions :-

Van’t Hoff Factor
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What amount of CaCl2(i=2.47) is dissolved in 2L water so that its osmotic pressure is 0.5 atm at 27$°\mathrm{C}$:-

(1) 13.42 g

(2) 19.24 g

(3) 8.834 g

(4) 1.820 g

Concept Questions :-

Osmosis and Osmotic Pressure
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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 molarity 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

Concept Questions :-

Osmosis and Osmotic Pressure
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The total vapour of a solution of liquid A and liquid b is 600 torr. The mole fraction of component A in liquid phase is 0.7. The vapour pressure of pure A and B are respectively

(1) 300 torr, 130 torr

(2) 1300 torr, 130 torr

(3) 300 torr, 1300 torr

(4) 300 torr, 300 torr

Concept Questions :-

Dalton’s Law of Partial Pressure/ Henry"s law
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The vapour pressure of water at room temperature is 30 mm of Hg. If the mole fraction of the water is 0.9, the vapour pressure of solution will be

(1) 30 mm of Hg

(2) 24 mm of HG

(3) 21 mm of Hg

(4) 27 mm of Hg

Concept Questions :-

Dalton’s Law of Partial Pressure/ Henry"s law
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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

Concept Questions :-

Van’t Hoff Factor
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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

Concept Questions :-

Relative Lowering of Vapour Pressure/ Vapour Pressure
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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

Concept Questions :-

Van’t Hoff Factor
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Difficulty Level: