Mass Transfer
Priming in a distillation column

Is desirable from point efficiency consideration
Is characterised by the presence of foam throughout the space between trays
Reduces the overall pressure drop
Results from very low gas velocity

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

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

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