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Manipal Engineering Manipal Engineering Solved Paper-2012

  • question_answer
    An aqueous solution contains following ions: \[Hg_{2}^{2+},\,\,H{{g}^{2+}},\,\,P{{b}^{2+}}\]and\[C{{d}^{2+}}\].On adding\[HCl\], which of these will precipitate?

    A) \[H{{g}_{2}}C{{l}_{2}}\]

    B)        \[PbC{{l}_{2}}\]

    C) \[H{{g}_{2}}C{{l}_{2}}\]and\[PbC{{l}_{2}}\]

    D)        \[HgC{{l}_{2}}\]and\[PbC{{l}_{2}}\]

    Correct Answer: C

    Solution :

    \[Hg_{2}^{2+}\]and\[P{{b}^{2+}}\]have been placed in I group of basic radicals as their\[{{K}_{sp}}\]less than the II group ions\[(H{{g}^{2+}},\,\,C{{d}^{2+}})\]. Hence, only these will precipitate.


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