Mass Transfer
Pick out the wrong statement. Raoult's law does not apply, when the

Size of component molecules are not equal
Attractive forces between like and unlike molecules in the solution are approximately equal
Chemical combination or molecular association between unlike molecules takes place in the formation of solution
Component molecules are nonpolar

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

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

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