Mass Transfer
As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages

Remain unchanged
Decrease
Can either increase or decrease, depends on the system
Increase

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Mass Transfer
In saturated gas, the

Vapour is in equilibrium with the liquid at the room temperature
Vapour is in equilibrium with the liquid at the gas temperature
Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
None of the listed here

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