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

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

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Mass Transfer
Flash distillation is

Same as differential distillation
Same as simple distillation
Used for multicomponent systems like crude refining
Most useful for handling binary systems

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