JEE Main & Advanced Sample Paper JEE Main - Mock Test - 23

  • question_answer
    The metal extracted by leaching with a cyanide is

    A) Mg                   

    B)        Ag

    C) Cu                   

    D)        Na

    Correct Answer: B

    Solution :

    Silver ore forms a soluble complex with NaCN from which silver is precipitated using scrap zinc. \[4Ag\,+8C{{N}^{-}}+\,2{{H}_{2}}O+{{O}_{2}}\to \underset{So\operatorname{lub}le\,\,complex}{\mathop{4[Ag{{(C{{N}_{2}})}^{-}}}}\,+\,\,4O{{H}^{-}}\]

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