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Mass Transfer - Engineering

Q1:

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

A size of component molecules are not equal.

B attractive forces between like and unlike molecules in the solution are approximately equal.

C component molecules are nonpolar.

D chemical combination or molecular association between unlike molecules takes place in the formation of solution.

ANS:C - component molecules are nonpolar.

The wrong statement is: "component molecules are nonpolar." Raoult's law applies to ideal solutions, where the component molecules are assumed to be nonpolar. Ideal solutions are those where the intermolecular forces between like molecules (homogeneous interactions) are approximately equal to the intermolecular forces between unlike molecules (heterogeneous interactions), leading to ideal behavior as described by Raoult's law. Therefore, if the component molecules were nonpolar, it would be consistent with the conditions for Raoult's law to apply.