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(thiocyanate give rise to a deep blue crystalline precipitate. The metal ion is
A. Pb2^+
B. Hg2^+
C. Cu2^+
D. Co2^+
Answer:B
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(thiocyanate give rise to a deep blue crystalline precipitate. The metal ion is
A. Pb2^+ B. Hg2^+ C. Cu2^+ D. Co2^+