Question

For a non-ideal solution showing negative deviation from Raoult’s law, A-B molecular interaction forces are ______ than A-A and B-B molecular interaction forces.

Answer 1

For a non-ideal solution showing negative deviation from Raoult’s law, A-B molecular interaction forces are stronger than A-A and B-B molecular interaction forces.

Explanation:

For a non-ideal solution that shows negative deviation from Raoult’s law, the A-B molecular interactions are stronger than the A-A and B-B interactions. This leads to fewer molecules escaping into the vapour phase, resulting in a lower vapour pressure than predicted by Raoult’s Law. Such solutions also exhibit exothermic mixing ΔH_mix < 0 due to the release of energy when stronger A-B interactions are formed.