Question

A solution containing components A and B follows Raoult’s law. With reference to the statement, which of the following options is correct?

Options

• A-B attraction force is greater than A-A and B-B.

• A-B attraction force is less than A-A and B-B.

• A-B attraction force remains the same as A-A and B-B.

• Total volume of solution is different from sum of volumes of both components A and B.

Answer 1

A-B attraction force remains the same as A-A and B-B.

Explanation:

Raoult’s Law is obeyed only by ideal solutions. For a solution to be ideal:

The intermolecular forces between A-B must be equal to those between A-A and B-B. There should be no heat change upon mixing (ΔHₘᵢₓ = 0). The total volume of solution must be equal to the sum of volumes of components (i.e., no volume change on mixing). Therefore, A-B = A-A = B-B in strength for an ideal solution.