Question

Assertion (A): When NaCl is added to water, elevation in boiling point is observed. Reason (R): Elevation in boiling point is a colligative property.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false
• D. Assertion (A) is false, but Reason (R) is true.

Hint:

Colligative properties depend on the number of solute particles in a solution, not their identity. Other colligative properties include freezing point depression, osmotic pressure, and vapor pressure lowering.

Answer 1

The Correct Option is B

Adding NaCl to water increases the boiling point due to the presence of dissolved ions, which disrupt the vapor pressure of the solution. While boiling point elevation is a colligative property, the effect also depends on the number of solute particles rather than the chemical nature of the solute.