(i) Methanol and acetone.

(ii) Chloroform and acetone.

(iii) Nitric acid and water.

(iv) Phenol and aniline.

Correct Answer: (i) Methanol and acetone

Explanation: The mixture of methanol and acetone shows a positive deviation from Raoult’s Law. Pure methanol has hydrogen bonding. The introduction of acetone between methanol molecules leads to the breakdown of some of these hydrogen bonds. Due to the weakening of cooperation, the solution shows a positive deviation from Raoult’s law.