STD 12 - 10. Biomolecules — NEET STD 11 Science — Question

$STATEMENT$-$2$: $o$-Hydroxybenzoic acid has intramolecular hydrogen bonding.

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

$\mathrm{A}(l) \rightarrow 2 \mathrm{B}(\mathrm{g})$

$\Delta \mathrm{U}=2.1\; \mathrm{kcal}, \Delta \mathrm{S}=20\; \mathrm{cal} \mathrm{K}^{-1}$ at $300\; \mathrm{K}$

Hence $\Delta \mathrm{G}$ in $\mathrm{kcal}$ is