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

The correct option is C (C) Statement-I is true, Statement-II is false.
The sparingly soluble chlorides derived from $$Pb^{2+},H_{2}^{2+}$$ and $$Ag^{+}$$ 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 $$25^{\circ}C$$
$$PbCl_{2}$$       $$1.6\times 10^{-5}$$
$$Hg_{2}Cl_{2}$$     $$1.3\times 10^{-18}$$
$$AgCl$$         $$1.8\times 10^{-10}$$

Chemistry

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