**Assertion:** Solubility of BaSO_4 in 0.1 M Na_2SO_4 is 10^ -9 M, hence its K_ sp is 10^ -18 . **Reason:** Because for BaSO_4, K_ sp =S^2.

JEE Main Chemistry question

**Assertion:** Solubility of in 0.1 M is M, hence its is . **Reason:** Because for , .

(A)Assertion is True, Reason is True; Reason is correct explanation for Assertion
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is TrueCorrect

Answer: (D)

Solution

The Reason () is the correct formula **only for dissolution in pure water** (no common ion). In the Assertion's scenario, a large excess of common ion (0.1 M) is already present, so the correct relation is

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Question ID VK-135973