Assertion: Decrease in the vapour pressure of water by adding 1 mol of sucrose to one kg of water is higher to that produced by adding 1 mol of urea to the same quantity of water at the same temperature. Reason: Molecular mass of sugar is less than that of urea.

Question

Assertion: Decrease in the vapour pressure of water by adding 1 mol of sucrose to one kg of water is higher to that produced by adding 1 mol of urea to the same quantity of water at the same temperature. Reason: Molecular mass of sugar is less than that of urea. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · Accepted Answer

Decrease in the vapour pressure of solvent depends on the quantity of non-volatile solute irrespective of its nature. Hence, decrease will be same in both the cases.

Q. Assertion : Decrease in the vapour pressure of water by adding 1mol of sucrose to one kg of water is higher to that produced by adding 1mol of urea to the same quantity of water at the same temperature. Reason : Molecular mass of sugar is less than that of urea.

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

Decrease in the vapour pressure of solvent depends on the quantity of non-volatile solute irrespective of its nature. Hence, decrease will be same in both the cases.

Q. Assertion : Decrease in the vapour pressure of water by adding $1 m o l$ of sucrose to one $k g$ of water is higher to that produced by adding $1 m o l$ of urea to the same quantity of water at the same temperature.
Reason : Molecular mass of sugar is less than that of urea.