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J & K CET Medical J & K - CET Medical Solved Paper-2015

  • question_answer
    In an acidified aqueous solution of\[M{{n}^{2+}},N{{i}^{2+}},C{{u}^{2+}}\] and\[H{{g}^{2+}}\]ions,\[{{H}_{2}}S\]gas was passed. Precipitates are

    A)  MnS and CuS      

    B)  NiS and HgS

    C)  MnS and NiS       

    D)  CuS and HgS

    Correct Answer: D

    Solution :

     The black precipitate of\[CuS\]and\[HgS\]will be formed. \[C{{u}^{2+}}+{{H}_{2}}S\xrightarrow{{}}CuS(black)\downarrow +{{H}_{2}}\uparrow \] \[H{{g}^{2+}}+{{H}_{2}}S\xrightarrow{{}}HgS(black)\downarrow +{{H}_{2}}\uparrow \]


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