Assertion : ${P b C l}_{2}$ and ${H g}_{2} {C l}_{2}$ precipitates can be separated by hot water. Reason: ${H g}_{2} {C l}_{2}$ is blackened by ${a q . N H}_{3}$

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
${P b C l}_{2}$ and ${H g}_{2} {C l}_{2}$ precipitates can be separated by hot water.
${P b C l}_{2}$ is soluble in hot water whereas and ${H g}_{2} {C l}_{2}$ is insoluble in hot water.
${H g}_{2} {C l}_{2}$ is blackened by ${a q . N H}_{3}$
due to formation of $({H g N H}_{2} C l + H g)$ .
$H g_{2} C l_{2} + 2 N H_{4} O H \to H_{2} N - H g - C l + H g ↓ b l a c k + N H_{4} C l + 2 H_{2} O$
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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