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JEE Main & Advanced Chemistry Analytical Chemistry Question Bank Mock Test - Principles Related to Practical Chemistry

  • question_answer
    A solution of metal ion when treated with KI, gives a red precipitate that dissolves in excess of KI to give a colorless 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

    A) \[P{{b}^{2+}}\]         

    B) \[H{{g}^{2+}}\]

    C) \[C{{u}^{2+}}\]         

    D) \[C{{o}^{2+}}\]

    Correct Answer: B

    Solution :

    [b] \[H{{g}^{2+}}+{{I}^{-}}\to Hg{{I}_{2}}\](Scarlet red ppt.) \[Hg{{I}_{2}}+2{{I}^{-}}\to {{[Hg{{I}_{4}}]}^{2-}}\](Soluble) \[H{{g}^{2+}}+Co{{(SCN)}_{2}}\to Co[Hg{{(SCN)}_{4}}]\] (Deep blue crystalline ppt.)


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