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

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
Size of component molecules are not equal

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Mass Transfer
Channelling is most severe

In towers packed with stacked packing
At very high liquid flow rate
In dumped packing of regular units
In towers packed randomly with crushed solids

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