Discussion
Assertion (A): A relative volatility of one makes separation by ordinary distillation impossible.
Reason (R): The vapour formed then has the same composition as the liquid it came from.
Answer: B
Both are true and the reason gives the mechanism: distillation works only because the vapour is enriched, so when the enrichment vanishes no number of stages helps. The limit is thermodynamic rather than one of contacting.
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