MCQ
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 $K$ and $Cl$ are $39$ and $35.5\, g \,mol ^{-1}$ ]. 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
- ✓Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A)$
- BBoth $(A)$ and $(R)$ are true but $(R)$ is not the correct explanation of $(A)$
- C$(A)$ is true but $( R )$ is false
- D$(A)$ is false but $(R)$ is true