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A solution of a metal ion when treated with KI gives a red precipitate which dissolves in excess of KI to give a colourless solution. Moreover, the solution of metal ion on treatment with a solution of cobalt(II) thiocyanate gives rise to deep blue crystalline precipitate. The metal ion is 

(a) Pb2+ 

(b) Hg2+ 

(c) Cu2+ 

(d) Co2+

1 Answer

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Best answer

Correct option (b)

Explanation:

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