Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R).
Assertion(A) : In the presence of dilute HCl, Zn²⁺ is not precipitated by S^2– ions.
Reason (R) : The dissociation of H₂S is suppressed by addition of dilute HCl.
In light of the given statements, choose the correct answer from the options given below.

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Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true and (R) is not the correct explanation of (A)

(A) is true and (R) is false

Both (A) and (R) are false.

answer is A.

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Detailed Solution

Solubility of ZnS is relatively higher than the sulphides of group II. So a high concentration of S ² ions is required to cause the precipitation. If HCl is already present, then the dissociation of H₂S will be greatly suppressed due to common ion effect. As a result, enough S^-2 ions are not there to cause the precipitation.

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