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JEE Main & Advanced Chemistry Coordination Chemistry Question Bank Critical Thinking Coordination

  • question_answer
    In the process of extraction of gold, Roasted gold ore\[+C{{N}^{-}}+{{H}_{2}}O\xrightarrow{{{O}_{2}}}[X]+O{{H}^{-}}\] \[[X]+Zn\to [Y]+Au\] Identify the complexes [X] and [Y] [IIT-JEE 2003]

    A) \[X={{[Au{{(CN)}_{2}}]}^{-}},\,Y={{[Zn{{(CN)}_{4}}]}^{2-}}\]

    B) \[X={{[Au{{(CN)}_{4}}]}^{3-}},\,Y={{[Zn{{(CN)}_{4}}]}^{2-}}\]

    C) \[X={{[Au{{(CN)}_{2}}]}^{-}},\,Y=Zn{{(CN)}_{6}}{{]}^{4-}}\]

    D) \[X={{[Au{{(CN)}_{4}}]}^{-}},\,Y={{[Zn{{(CN)}_{4}}]}^{2-}}\]

    Correct Answer: A

    Solution :

    \[\underset{\text{gold ore}}{\mathop{\text{Roasted}}}\,+C{{N}^{-}}+{{H}_{2}}O\xrightarrow{{{O}_{2}}}\,{{[Au\,{{(CN)}_{2}}]}^{-}}+O{{H}^{-}}\] \[{{\left[ Au\,{{(CN)}_{2}} \right]}^{\,-}}+Zn\to {{\left[ Zn\,{{(CN)}_{4}} \right]}^{\,2-}}\].


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