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JEE Main & Advanced Chemistry The d-and f-Block Elements / d तथा f ब्लॉक के तत्व Question Bank Compounds of Transitional Elements

  • question_answer
    In the equation \[4M+8C{{N}^{-}}+2{{H}_{2}}O+{{O}_{2}}\xrightarrow{{}}4{{[M(C{{N}_{2}})]}^{-}}+4O{{H}^{-}}\] The metal M is  [MP PET 2000]

    A) Copper

    B) Iron

    C) Gold

    D) Zinc

    Correct Answer: C

    Solution :

    \[4Au\,+\,8KCN\,+\,2{{H}_{2}}O\,+\,{{O}_{2}}\to \underset{\begin{smallmatrix}  (\text{Solube} \\  \text{comple x}) \end{smallmatrix}}{\mathop{4K[Au\,{{(CN)}_{2}}]}}\,+4KOH\]


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