Mass Transfer
In gas-liquid contact operation, the number of ideal stages, N = (xa - xb)/(xb - x*b) . This is true when the stripping factor 'S' is

S = ∞
S > 1
S < 1
S = 1

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Mass Transfer
Inside the distillation column, the

Pressure increases gradually from bottom to the top of the column
None of these
Driving force for the vapour flow is the pressure drop
Liquids are not always at their bubble points

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