With increase in pressure, the relative volatility for a binary system_________________?
Correct answer: C. Decreases
- A. Increases
- B. Remains same
- C. Decreases
- D. Either A. or B., depends on the system
Explanation
For ordinary binary vapour-liquid systems, increasing pressure brings the component K-values closer together, so their ratio, the relative volatility, generally decreases. This is why high-pressure distillation is usually more difficult.
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