Question: If xD = overhead product molal composition and RD = reflux ratio, then slope and intercept of the operating line for rectifying section are respectively

If xD = overhead product molal composition and RD = reflux ratio, then slope and intercept of the operating line for rectifying section are respectively
[xD/(RD +1)],[RD/(RD +1)]
[RD/(RD +1)],[xD/(xD +1)]
[xD/(RD +1)],[(RD +1)/RD]
None of these

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