A solution of a metal ion when treated with KI gives a red precipitate which dissolves in excess KI to give a colourless

Question

A solution of a metal ion when treated with KI gives a red precipitate which dissolves in excess KI to give a colourless solution Moreover the solution of metal ion on treatment with a solution of cobalt II thiocyanate gives rise to a deep blue crystalline precipitate The metal ion is 1 Pb 2 Hg 3 Cu 4 Co

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