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NEET Sample Paper NEET Sample Test Paper-64

  • question_answer
    Which one of the following metals could not be obtained on electrolysis of aqueous solution of its salts

    A) Ag                               

    B) Mg

    C) Cu                               

    D) Cr

    Correct Answer: B

    Solution :

    The reduction potential of Mg is less than that of water\[(E{}^\circ = -0.83 V)\]. Hence their ions in the aqueous solution cannot be reduced instead water will be reduced                                     \[2{{H}_{2}}O+2{{e}^{-}}\,\,\to \,\,{{H}_{2}}\,\,+\,\,2O{{H}^{-}}\]


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