An aqueous solution of a transition metal sulphate reacts with gas to give a black precipitate. This precipitate is filtered and found to be soluble in 50% . Treating this resulting solution with an e

Question

An aqueous solution of a transition metal sulphate reacts with $H_2S$ gas to give a black precipitate. This precipitate is filtered and found to be soluble in 50% $HNO_3$. Treating this resulting solution with an excess of $NH_4OH$ yields an intense deep-blue solution. The transition metal is:

Prashant Kotian · Accepted Answer

Correct answer: C. The black precipitate soluble in 50% points to (unlike , , or which require aqua regia). The definitive confirmation is the intense deep-blue solution formed with excess ammonia, which is the tetraamminecopper(II) complex, .

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