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BHU PMT BHU PMT Solved Paper-2003

  • question_answer
    The values of standard oxidation potentials of following reactions are given below: (i) \[Zn\xrightarrow[{}]{{}}Z{{n}^{2+}}+2{{e}^{-}};{{E}^{o}}=0.762\,V\] (ii) \[Fe\xrightarrow[{}]{{}}F{{e}^{2+}}+2{{e}^{-}};{{E}^{o}}=0.440\,V\] (iii) \[Cu\xrightarrow[{}]{{}}C{{u}^{2+}}+2{{e}^{-}};{{E}^{o}}=-0.345\,V\] (iv) \[Ag\xrightarrow[{}]{{}}A{{g}^{+}}+{{e}^{-}};{{E}^{o}}=-0.800\,V\] Which of the following is most easily reduced?

    A)  Fe                                         

    B)  Ag

    C)  Zn                                         

    D)  Cu

    Correct Answer: B

    Solution :

                     Key Idea: Lower the oxidation potential of the element easier will be its reduction. Compare the oxidation potential of elements and find the answer. \[\because \] Ag has lowest oxidation potential among given choices. \[\therefore \]Ag is reduced most easily.


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