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EAMCET Medical EAMCET Medical Solved Paper-1998

  • question_answer
    The standard reduction potentials at 298 K for the following half cell reactions are given below: \[Z{{n}^{2+}}(aq)+2{{e}^{-}}\rightleftharpoons Zn(s)-0.762\] \[C{{r}^{3+}}(aq)+3{{e}^{-}}\rightleftharpoons Cr(s)-0.74\] \[2{{H}^{+}}(aq)+2{{e}^{-}}\rightleftharpoons {{H}_{2}}(g)\,0.00\] \[F{{e}^{3+}}(aq)+{{e}^{-}}\rightleftharpoons F{{e}^{2+}}(aq)+0.77\] Which one of the following is the strongest reducing agent?

    A)  \[Zn(s)\]                            

    B)  \[Cr(s)\]

    C)  \[{{H}_{2}}(g)\]                               

    D)  \[F{{e}^{2+}}(aq)\]

    Correct Answer: A

    Solution :

                     The metals having higher -ve value of standard reduction potential are placed above hydrogen in electrochemical series. The metals placed above hydrogen has a great tendency to donate electrons or oxidising power. The metals having great oxidising power are strongest reducing agent. Zinc has higher-ve value of standard reduction potential. Therefore, it is the strongest reducing agent.


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