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Assertion:When a solution of non-volatil...

Assertion:When a solution of non-volatile solute in water is cooled slightly below its freezing temperature, some ice separates out and then freezing stops.
Reason: Separation of ice increases the molality of the left over solution.

A

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

B

Both Assertion and Reason are true and Reason is not the correct explanation of Assertion

C

Assertion is true but Reason is false

D

Both Assertion and Reason are false

Text Solution

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The correct Answer is:
A
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When some amount of non-volatile solute is dissolved in a solvent to prepare a dilute solution, the vapour pressure of the solvent is lowered and it is directly proportional to the mole fraction of solvent in the solution . Relative lowering in vapour pressure is equal to mole fraction of solute . Elevation in boiling point of solvent is a collgative property like lowering in vaour pressure of solvent in solution , K_(b) i.e., molal elevation constant is calculated by the formula, K_(b)=DeltaT_(b)// molality and also by the expression, K_(b)=RT_(b)^(2)//1000l_(v) where T_(b) is boiling point of solvent and I_(v) is latent heat of vapourisation for 1 gm solvent . Abnormal elevation is boiling point =iX elevation in boiling point in ideal solution where i=van't Hoff factor Lowering in vapour pressure in an experiment was found to be x mm of Hg. It is : Lowering in vapour pressure in an experiment was found to be x mm of Hg. It is

When some amount of non-volatile solute is dissolved in a solvent to prepare a dilute solution, the vapour pressure of the solvent is lowered and it is directly proportional to the mole fraction of solvent in the solution . Relative lowering in vapour pressure is equal to mole fraction of solute . Elevation in boiling point of solvent is a collgative property like lowering in vaour pressure of solvent in solution , K_(b) i.e., molal elevation constant is calculated by the formula, K_(b)=DeltaT_(b)// molality and also by the expression, K_(b)=RT_(b)^(2)//1000l_(v) where T_(b) is boiling point of solvent and I_(v) is latent heat of vapourisation for 1 gm solvent . Abnormal elevation is boiling point =iX elevation in boiling point in ideal solution where i=van't Hoff factor Relative lowering in vapour pressure :

Assertion:When dry air is passed continuously through an aqueous solution of non-volatile solute, vapour pressure of solution decreases gradually. Reason: Some air absorbed in the solution.

Assertion: When NaCl is added to water a depression in freezing point is observed Reason: The lowering in vapour pressure of a solution causes depression in freezing point.

Assertion:Addition of salt decreases the freezing point of water. Reason: When salt is added to water, the equilibrium between water and ice is disturbed as fewer water molecules reach the surface of the ice in a given time and so water freezes slowly

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AAKASH SERIES-SOLUTIONS -Objective Exercise -4
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  10. Assertion:Ether has higher vapour pressure than water at a given tempe...

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  16. Assertion:When a solution of non-volatile solute in water is cooled sl...

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  17. Assertion:When dry air is passed continuously through an aqueous solut...

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  18. Assertion: van't Hoff factor of NaCl is expected to be equal to 3 Re...

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  19. Assertion: 0.1M glucose, 0.1M urea solutions cause the same osmotic pr...

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