Assertion :In acidic medium, $Z n^{2 +}$ is not precipitated by $S^{2 -}$ ions. Reason: Common ion effect reduces the concentration of $S^{2 -}$ ions to the minimum level.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In acidic solution, the concentration of actual sulfide ion is very low. This means that a quite basic cation is required to react with the available hydrogen sulfide (due to common ion effect).
Copper ions are more basic than zinc ions, so the copper can react with hydrogen sulfide, strip away the hydrogen, and form the insoluble $C u S .$
Zinc is not as basic and cannot strip away the H atoms to form the sulfide.

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Assertion :In acidic medium, Zn2+ is not precipitated by S2− ions. Reason: Common ion effect reduces the concentration of S2− ions to the minimum level.

Assertion :In acidic medium, $Z n^{2 +}$ is not precipitated by $S^{2 -}$ ions. Reason: Common ion effect reduces the concentration of $S^{2 -}$ ions to the minimum level.