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CMC Medical CMC-Medical Ludhiana Solved Paper-2011

  • question_answer
    In the equation\[4M+8C{{N}^{-}}+2{{H}_{2}}O+{{O}_{2}}\to 4\,{{[M{{(CN)}_{2}}]}^{-}}+4O{{H}^{-}}\]Identify the metal M

    A)  Copper               

    B)  Iron

    C)  Silver                                   

    D)  Zinc

    Correct Answer: C

    Solution :

                    \[4Ag+8C{{N}^{-}}+2{{H}_{2}}O+{{O}_{2}}\xrightarrow[{}]{{}}4\,{{[Ag{{(CN)}_{2}}]}^{-}}+4O{{H}^{-}}\] This process is called cyanide process. It is used in the extraction of silver from argentite\[(A{{g}_{2}}S)\].


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