The solution of II A group precipitate in dil | vedclass

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(D) The $II A$ group precipitate (sulfides) dissolves in dilute $HNO_3$ to form metal nitrates. When $NH_4OH$ is added to the solution containing $Cu^

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$Cu$

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(D) The $II A$ group precipitate (sulfides) dissolves in dilute $HNO_3$ to form metal nitrates. When $NH_4OH$ is added to the solution containing $Cu^{2+}$ ions,it forms a deep blue complex,tetraamminecopper$(II)$ ion. The reaction is: $Cu^{2+} + 4NH_4OH 	o [Cu(NH_3)_4]^{2+} + 4H_2O$. The deep blue color is characteristic of the $[Cu(NH_3)_4]^{2+}$ complex.

The solution of $II A$ group precipitate in dilute $HNO_3$ when treated with $NH_4OH$ becomes blue because of the presence of

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