(A) Give a blue solution in H_(2)O. On passing H_(2)S, a black precipitate (B) is formed which is soluble in HNO_(3). On addition of NaOH, the solution gives glue precipitate (C ) which becomes black on boiling in NaOH. On passing ammonia into solution of (A) in water, a deep blue precipitate is ofrmed, which dissolves in excess of NH_(3) giving deep blue colouration (D). Treatment of KCN with aqueous solution of (A) gives a yellow ppt. (E) which dissloves in excess of KCN giving a colourless solution.

(A) Give a blue solution in H_(2)O. On passing H_(2)S, a black precipi

1.	(A) Give a blue solution in H_(2)O. On passing H_(2)S, a black precipitate (B) is formed which is soluble in HNO_(3). On addition of NaOH, the solution gives glue precipitate (C ) which becomes black on boiling in NaOH. On passing ammonia into solution of (A) in water, a deep blue precipitate is ofrmed, which dissolves in excess of NH_(3) giving deep blue colouration (D). Treatment of KCN with aqueous solution of (A) gives a yellow ppt. (E) which dissloves in excess of KCN giving a colourless solution.
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