Question

Assertion: Equimolal solutions of different non-volatile and non-electrolytic substances dissolved in the same solvent exhibit the same elevation of boiling point.

Reason: All solvents boil when their vapour pressures become equal to the atmospheric pressure.

Options

• If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.

• If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.

• If Assertion is CORRECT but Reason is INCORRECT.

• If Assertion is INCORRECT but Reason is CORRECT.

Answer 1

If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.

Explanation:

The assertion is correct because equimolal solutions of non-volatile, non-electrolytic solutes exhibit the same elevation of boiling point, as boiling point elevation is a colligative property depending only on the number of solute particles. The reason is also correct,  a liquid boils when its vapour pressure equals atmospheric pressure, but it does not explain why equimolal solutions show the same elevation.