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

Answer 1

Answer: (D)

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.