Mass Transfer
Relative humidity is the ratio of the

Actual humidity to saturation humidity
Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature
None of these
Partial pressure of the vapour to the vapour pressure of the liquid at room temperature

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Relative volatility is reasonably constant
Mixture (to be separated) shows positive deviation from ideality
Multicomponent distillation is involved
Mixture (to be separated) shows negative deviation from ideality

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