Raoult's law is obeyed by each constituent of a binary liquid sol…

MCQ

Raoult's law is obeyed by each constituent of a binary liquid solution when:

A
The forces of attractions between like molecules are greater than those between unlike molecules.
B
The forces of attractions between like molecules are smaller than those between unlike molecules.
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The forces of attractions between like molecules are identical with those between unlike molecules.
D
The volume occupied by unlike molecules are different.

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Answer

Correct option: C.

The forces of attractions between like molecules are identical with those between unlike molecules.

When the forces of attractions between like molecules are identical with those between unlike molecules, Raoult's law is obeyed by each constituent of a binary liquid solution.
In such case, the total vapour pressure of the solution is the sum of the partial vapour pressures of components of the solution.