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CHXII02:SOLUTIONS

319330 Three solutions are prepared by adding ‘w’ gram of ‘A’ into 1 kg of water, ‘w’ gram of ‘B’ into another 1 kg of water and ‘w’ gram of ‘C’ in another 1 kg of water (A, B, C are non electrolyte). Dry air is passed from these solutions in sequence $(A \to B \to C)$ . The loss in weight of solution A was found to be 2g, while solution B gained 0.5 g and solution C lost 1 g. Then the relation between molar masses of A, B and C are

1

M_{A} : M_{B} : M_{C} = 4 : 3 : 5

2

M_{A} : M_{B} : M_{C} = \frac{1}{4} : \frac{1}{3} : \frac{1}{5}

3

M_{C} > M_{A} > M_{B}

4

M_{B} > M_{A} > M_{C}

Explanation:

The loss in water should be proportional to vapor pressure above that solution :
$S o, P_{S_{A}} \propto 2 g P_{S_{B}} \propto 1 .5 g P_{S_{C}} \propto 2 .5 g$
So, maximum vapor pressure is above C solution; hence it is having minimum lowering and hence minimum mole fraction (hence minimum number of moles of solute). So, maximum molar mass of a substance.

CHXII02:SOLUTIONS

319331 Statement A :
Lowering of vapour pressure depends only on the concentration of the solute particles.
Statement B :
RLVP, related to the concentration term mole fraction.

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both Statements are correct.

4 Both Statements are incorrect.

CHXII02:SOLUTIONS

319332 The vapour pressure of a solution having solid as solute and liquid as solvent is

1 directly proportional to mole fraction of the solvent

2 inversely proportional to mole fraction of the solute

3 directly proportional to mole fraction of the solute

4 inversely proportional to mole fraction of the solute

CHXII02:SOLUTIONS

319333 Assertion :
If a liquid solute, more volatile than the solvent, is added to the solvent, the vapour pressure of the solution may increase i.e., $p_{s} > p^{\circ}$ .
Reason :
In the presence of a more volatile liquid solute, only the solute will form the vapours and solvent will not.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXII02:SOLUTIONS

319330 Three solutions are prepared by adding ‘w’ gram of ‘A’ into 1 kg of water, ‘w’ gram of ‘B’ into another 1 kg of water and ‘w’ gram of ‘C’ in another 1 kg of water (A, B, C are non electrolyte). Dry air is passed from these solutions in sequence $(A \to B \to C)$ . The loss in weight of solution A was found to be 2g, while solution B gained 0.5 g and solution C lost 1 g. Then the relation between molar masses of A, B and C are

1

M_{A} : M_{B} : M_{C} = 4 : 3 : 5

2

M_{A} : M_{B} : M_{C} = \frac{1}{4} : \frac{1}{3} : \frac{1}{5}

3

M_{C} > M_{A} > M_{B}

4

M_{B} > M_{A} > M_{C}

Explanation:

The loss in water should be proportional to vapor pressure above that solution :
$S o, P_{S_{A}} \propto 2 g P_{S_{B}} \propto 1 .5 g P_{S_{C}} \propto 2 .5 g$
So, maximum vapor pressure is above C solution; hence it is having minimum lowering and hence minimum mole fraction (hence minimum number of moles of solute). So, maximum molar mass of a substance.

CHXII02:SOLUTIONS

319331 Statement A :
Lowering of vapour pressure depends only on the concentration of the solute particles.
Statement B :
RLVP, related to the concentration term mole fraction.

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both Statements are correct.

4 Both Statements are incorrect.

CHXII02:SOLUTIONS

319332 The vapour pressure of a solution having solid as solute and liquid as solvent is

1 directly proportional to mole fraction of the solvent

2 inversely proportional to mole fraction of the solute

3 directly proportional to mole fraction of the solute

4 inversely proportional to mole fraction of the solute

CHXII02:SOLUTIONS

319333 Assertion :
If a liquid solute, more volatile than the solvent, is added to the solvent, the vapour pressure of the solution may increase i.e., $p_{s} > p^{\circ}$ .
Reason :
In the presence of a more volatile liquid solute, only the solute will form the vapours and solvent will not.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXII02:SOLUTIONS

319330 Three solutions are prepared by adding ‘w’ gram of ‘A’ into 1 kg of water, ‘w’ gram of ‘B’ into another 1 kg of water and ‘w’ gram of ‘C’ in another 1 kg of water (A, B, C are non electrolyte). Dry air is passed from these solutions in sequence $(A \to B \to C)$ . The loss in weight of solution A was found to be 2g, while solution B gained 0.5 g and solution C lost 1 g. Then the relation between molar masses of A, B and C are

1

M_{A} : M_{B} : M_{C} = 4 : 3 : 5

2

M_{A} : M_{B} : M_{C} = \frac{1}{4} : \frac{1}{3} : \frac{1}{5}

3

M_{C} > M_{A} > M_{B}

4

M_{B} > M_{A} > M_{C}

Explanation:

The loss in water should be proportional to vapor pressure above that solution :
$S o, P_{S_{A}} \propto 2 g P_{S_{B}} \propto 1 .5 g P_{S_{C}} \propto 2 .5 g$
So, maximum vapor pressure is above C solution; hence it is having minimum lowering and hence minimum mole fraction (hence minimum number of moles of solute). So, maximum molar mass of a substance.

CHXII02:SOLUTIONS

319331 Statement A :
Lowering of vapour pressure depends only on the concentration of the solute particles.
Statement B :
RLVP, related to the concentration term mole fraction.

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both Statements are correct.

4 Both Statements are incorrect.

CHXII02:SOLUTIONS

319332 The vapour pressure of a solution having solid as solute and liquid as solvent is

1 directly proportional to mole fraction of the solvent

2 inversely proportional to mole fraction of the solute

3 directly proportional to mole fraction of the solute

4 inversely proportional to mole fraction of the solute

CHXII02:SOLUTIONS

319333 Assertion :
If a liquid solute, more volatile than the solvent, is added to the solvent, the vapour pressure of the solution may increase i.e., $p_{s} > p^{\circ}$ .
Reason :
In the presence of a more volatile liquid solute, only the solute will form the vapours and solvent will not.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

CHXII02:SOLUTIONS

319330 Three solutions are prepared by adding ‘w’ gram of ‘A’ into 1 kg of water, ‘w’ gram of ‘B’ into another 1 kg of water and ‘w’ gram of ‘C’ in another 1 kg of water (A, B, C are non electrolyte). Dry air is passed from these solutions in sequence $(A \to B \to C)$ . The loss in weight of solution A was found to be 2g, while solution B gained 0.5 g and solution C lost 1 g. Then the relation between molar masses of A, B and C are

1

M_{A} : M_{B} : M_{C} = 4 : 3 : 5

2

M_{A} : M_{B} : M_{C} = \frac{1}{4} : \frac{1}{3} : \frac{1}{5}

3

M_{C} > M_{A} > M_{B}

4

M_{B} > M_{A} > M_{C}

Explanation:

The loss in water should be proportional to vapor pressure above that solution :
$S o, P_{S_{A}} \propto 2 g P_{S_{B}} \propto 1 .5 g P_{S_{C}} \propto 2 .5 g$
So, maximum vapor pressure is above C solution; hence it is having minimum lowering and hence minimum mole fraction (hence minimum number of moles of solute). So, maximum molar mass of a substance.

CHXII02:SOLUTIONS

319331 Statement A :
Lowering of vapour pressure depends only on the concentration of the solute particles.
Statement B :
RLVP, related to the concentration term mole fraction.

1 Statement A is correct but Statement B is incorrect.

2 Statement A is incorrect but Statement B is correct.

3 Both Statements are correct.

4 Both Statements are incorrect.

CHXII02:SOLUTIONS

319332 The vapour pressure of a solution having solid as solute and liquid as solvent is

1 directly proportional to mole fraction of the solvent

2 inversely proportional to mole fraction of the solute

3 directly proportional to mole fraction of the solute

4 inversely proportional to mole fraction of the solute

CHXII02:SOLUTIONS

319333 Assertion :
If a liquid solute, more volatile than the solvent, is added to the solvent, the vapour pressure of the solution may increase i.e., $p_{s} > p^{\circ}$ .
Reason :
In the presence of a more volatile liquid solute, only the solute will form the vapours and solvent will not.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

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