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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2011

  • question_answer
    \[{{H}_{2}}S\] is passed into one \[n{{m}^{3}}\] of a solution containing 0.1 mole of \[Z{{n}^{2+}}\] and 0.01 mole of \[C{{u}^{2+}}\] till the sulphide ion concentration reaches to \[8.1\times {{10}^{-19}}\] moles. Which one of the following statements is true? [\[{{K}_{sp}}\] of \[ZnS\] and \[CuS\] are \[3\times {{10}^{-22}}\] and\[8\times {{10}^{-36}}\] respectively.]

    A)  Only \[ZnS\] precipitates

    B)  Both \[CuS\] and \[ZnS\] precipitate

    C)  Only \[CuS\] precipitates

    D)  No precipitation occurs

    Correct Answer: B

    Solution :

    The ionic product for \[ZnS\,(0.1\times 8.1\times {{10}^{-19}})\]and for \[CuS\,(0.01\times 8.1\times {{10}^{-19}})\] exceeds their \[{{K}_{sp}}\]  values. Hence, both get precipitated.


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