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Through a solution containing Cu^(2+) an...

Through a solution containing `Cu^(2+) and Ni^(2+),H_(2)S` gas is passed after adding dil HCl, which will precipitate out and why ?

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`Cu^(2+)` will precipitate out because in the acidic medium, only ionic product `[Cu^(2+)][S^(2-)]` exceeds the solubility product of CuS.
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