Question

Only if the calculated molar mass is higher than the actual molar mass of the solute, the calculated molar mass is considered to be abnormal molar mass.

(a) True

(b) False

This question was posed to me in an international level competition.

My doubt is from Abnormal Molar Masses in section Solutions of Chemistry – Class 12

Answer 1

Right answer is (b) False

Explanation: When we correlate molar mass with osmotic pressure as a colligative property, we sometimes encounter a situation where the calculated molar mass of the solute is either higher or lower than the actual molar mass. This is called the abnormal molar mass. Abnormal molar mass occurs as a result of dissociation or association of molecules.