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J & K CET Engineering J and K - CET Engineering Solved Paper-2015

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