A solution of a metal ion, when treated with KI, gives a red precipitate which dissolves in an excess of KI to give a colourless solution. Moreover, the solution of the metal ion on treatment with a s

Question

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

Prashant Kotian · Accepted Answer

Correct answer: B. Step 1: The chromyl chloride test is used to detect chloride ions by heating a chloride salt with K2Cr2O7 and concentrated H2SO4 to form red-orange chromyl chloride (CrO2Cl2) gas. Step 2: However, highly covalent or extremely insoluble chlorides, such as AgCl, Hg2Cl2, HgCl2, and PbCl2, do not release chloride ions readily enough under these conditions to react. Step 3: Consequently, AgCl does not give a positive chromyl chloride test, resulting in no chromyl chloride gas being evolved (no gas). Thus, option (d) is correct.

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