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InterviewSolution
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Find the standard electrode potential of `MnO_(4)^(c-)|MnO_(2).` The standard electrode potential of `MnO_(4)^(c-)|Mn^(2+)=1.51V` and `MnO_(2)|MnO_(2)|Mn^(2+)=1.23V`.A. `-0.33V,` the reaction will not occurB. `-0.33V,` the reaction will occurC. `-2.69V,` the reaction will not occurD. `-2.69V,` the reaction will occur |
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Answer» Correct Answer - c `Mn^(2+)+e^(c-) rarr Mn," "E^(c-)=-1.18V` `2Mn^(3+)rarr 2Mn^(3+)+2e^(c-), " "E^(c-)=-1.51V` `ulbar(3Mn^(2+)rarr Mn+2Mn^(3+))` `E_(cell)^(c-)=E_(red)^(c-)+E_(o x i d)^(c-)` `=-1.18+(-1.51)=-2.69V` Negative `EMF` reflects non`-`spontaneous cell reaction. |
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