Mass Transfer
Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

(1 + Ro) = Ro/Ri
(1 - Ro) = Ro/Ri
(1 - Ri) = Ro/Ri
(1 + Ri) = Ro/Ri

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Mass Transfer
For absorbing a sparingly soluble gas in a liquid

Liquid side mass transfer co-efficient should be increased
Mass transfer co-efficient must be kept constant
Gas side mass transfer co-efficient should be increased
Liquid side mass transfer co-efficient should be decreased

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