Question

Given below are two statements:
Statement I: Vapours of the liquid with higher boiling point condense before vapours of the liquid with lower boiling points in fractional distillation.
Statement II: The vapours rising up in the fractionating column become richer in high boiling component of the mixture.

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is true but Statement II is false
• D. Statement I is false but Statement II is true

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Fractional distillation separates liquids based on their boiling points. The fractionating column provides multiple stages of condensation and re-evaporation.
Step 2: Detailed Explanation:
Statement I: The liquid with the higher boiling point is less volatile. As the vapours rise, they lose energy; the higher boiling point component will condense back into liquid at a lower height (earlier) than the more volatile component. (True)
Statement II: As the high-boiling component condenses and falls back down, the vapours continuing upward become increasingly richer in the more volatile (lower boiling point) component. (False)
Step 3: Final Answer:
Statement I is true but Statement II is false.