Question

Assertion :Statement-I: First group basic radicals are precipitated as their chlorides.
Reason: Statement-II: The solubility product of these chlorides are more than the solubility product of other basic radical chlorides.

Read the above assertion and reason and choose the correct option regarding it.

• A. (A) Statement-I is true, Statement-II is true ; Statement-II is correct explanation for Statement-I.
• B. (B) Statement-I is true, Statement-II is true ; Statement-II is NOT a correct explanation for Statement-I.
• C. (C) Statement-I is true, Statement-II is false.
• D. (D) Statement-I is false, Statement-II is true.

Answer 1

The correct option is C (C) Statement-I is true, Statement-II is false.

The sparingly soluble chlorides derived from $P{b}^{2+},H_2^{2+}$ and $A{g}^{+}$ ions are precipitated by the addition

of dilute HCI. Other cations do not get precipitated as chloride because their $K_{ap}$ is quite high.

Chloride $K_{ap}$ at ${25}^{\circ }C$

$PbC{l}_2$ $1.6\times {10}^{-5}$

$H{g}_{2}C{l}_2$ $1.3\times {10}^{-18}$

$AgCl$ $1.8\times {10}^{-10}$