alleryA fractionating column improves separation mainly by
Araising the boiling point of the feed
Bdrying the vapour before condensing
Cadding surface for vapour-liquid contact
Dlowering pressure inside the flask
Answer & Solution
Correct answer: C. adding surface for vapour-liquid contact
More contact surface lets rising vapour and falling condensate re-equilibrate many times, sharpening the separation.
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