Question

Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raoult’s law?

• A. Methanol and acetone
• B. Chloroform and acetone
• C. Nitric acid and water
• D. Phenol and aniline

Answer 1

Answer: (A)

Methanol and acetone

Answer 2

Mixture of methanol and acetone shows positive deviation from Raoult’s law. In pure methanol, molecules are hydrogen boded. On adding acetone, its molecules get in between the host molecules and break some of the hydrogen bonds between them.