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

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

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Mass Transfer
Steam distillation is used to

Avoid thermal decomposition of a component
Reduce the number of plates
Increase the efficiency of separation
Increase the total pressure of distillation

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