(A) : Solubility of sparingly soluble salt decreases due to common ion effect.
(R) : Solubility product constant does not depend on common ion effect.

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(A) is true but (R) is false

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

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

Both (A) and (R) are false

answer is B.

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Detailed Solution

Common ion effect: The degree of dissociation of a weak electrolyte is suppressed by the addition of another electrolyte containing the common ion.

So solubility of sparingly soluble salt decreases due to common ion effect but solubility product is independent of common ion effect as it is temperature dependent only and nature of the weak electrolyte.

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