Mass Transfer
The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will

Depend on saturated boiling point; may increase or decrease
Decrease
Increase
Remains same

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Mass Transfer
The wetted wall tower is used to determine

The overall M.T.C. of the system
Individual mass transfer co-efficient (M.T.C.) in gaseous system
M.T.C. of liquid in liquid-gas system
M.T.C. of individual components in a liquid-liquid system

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