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AMU Medical AMU Solved Paper-2000

  • question_answer
    The standard reduction potentials of some electrodes are                 \[{{E}^{o}}_{({{K}^{+}},K)}=-2.9\,V;\]                 \[{{E}^{o}}_{(Z{{n}^{2+}},Zn)}=-0.76\,\,V\]                 \[{{E}^{o}}_{\left( {{H}^{+}},\frac{1}{2}{{H}_{2}} \right)}=-0.0\]                 \[{{E}^{o}}_{(C{{u}^{2+}},Cu)}=-0.0\] The electrode acting as strong reductant is

    A)  K                                           

    B)  Cu

    C)  Zn                                         

    D)  \[{{H}_{2}}\]

    Correct Answer: A

    Solution :

                     Key Idea The substances which have lower reduction potentials are stronger reducing agents while those which have higher reduction potentials are stronger oxidising agents.                 \[{{E}^{o}}_{({{K}^{+}},K)}=-2.9\,\,V\]                 \[{{E}^{o}}_{(Zn\,\,;\,\,Zn)}=-0.76\,\,V\]                 \[{{E}^{o}}_{\left( {{H}^{+}},\frac{1}{2}{{H}_{2}} \right)}=-0.0\]                 \[{{E}^{o}}_{(C{{u}^{2+}},Cu)}=+0.34\,V\] Here, the reduction potential of potassium is lowest. So, the potassium (K) electrode acting as strong reductant.


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