Solutions

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : At 10\(^\circ\)C, the density of a 5 M solution of KCl [atomic masses of K & Cl are 39 & 35.5 g mol^\(-\)1 respectively], is 'x' g ml^\(-\)1. The solution is cooled to \(-\)21\(^\circ\)C. The molality of the solution will remain unchanged.

Reason (R) : The molality of a solution does not change with temperature as mass remains unaffected with temperature.

In the light of the above statements, choose the correct answer from the options given below :