For the following Assertion and Reason ,...

For the following Assertion and Reason , the correct option is
Assertion (A) : When Cu (II) and sulphide ions are mixed , they react together extremely quickly to give a solid .
Reason (R) : The equilibrium constant of `Cu^(2+) (aq) + S^(2-) (aq) hArr CuS (s)` is high because the solubility product is low .

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