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VIT Engineering VIT Engineering Solved Paper-2011

  • question_answer
    Assertion [A] \[C{{u}^{2+}}\] and \[C{{d}^{2+}}\] are separated by first adding \[KCN\] solution and then passing  \[{{H}_{2}}S\] gas.                               Reason [R] \[KCN\] reduces \[C{{u}^{2+}}\] to \[C{{u}^{+}}\] and forms a complex with it. The correct answer is

    A)  Both [A] and [R] are true and [R] is the correct explanation of [A]

    B)  Both [A] and [R] are true but [R] is not the correct explanation of [A]

    C)  [A] is true but [R] is not true

    D)  [A] is not true but [R] is true

    Correct Answer: B

    Solution :

     \[KCN\] forms complex with \[C{{u}^{+}}\] and \[C{{d}^{2+}}\] as \[{{K}_{3}}[Cu{{(CN)}_{4}}]\] and \[{{K}_{2}}[Cd{{(CN)}_{4}}]\] respectively. On passing \[{{H}_{2}}S\] only \[C{{d}^{2+}}\] complex gets decomposed to yellow CdS.


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