Question

Assertion :Ether can extract LiCl from the aqueous solution of a mixture of LiCl, NaCl and KCl. Reason: Hydration of $L{i}^{+}$ ion is greater than that of $N{a}^{+}$ and $K^{+}$ ions.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

As hydration energy is proportional to 1/cation size and as we move down the group, size increases so heat of hydration decreases.
$\Delta H_{Hydration}=\Delta H_{hydration}\left(cation\right)+\Delta H_{hydration}\left(anion\right)$
And order is
KCl < NaCl < LiCl.
The anomalous behavior of lithiumis due to the : (i) exceptionally small size of its atomand ion, and (ii) highpolarising power (i.e., charge/ radius ratio ). As a result, there is increased covalent character of lithiumcompoundwhich is responsible for their solubility in organic solvent.
So ether can extract LiCl from the aqueous solution of a mixture of LiCl, NaCl and KCl.