InterviewSolution
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InterviewSolution
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`E_(RP)^(@)` and their respective half reactions for some change are given below: i) `Mn^(7+)(aq)+8H^(+)+5erarrMn^(2+)(aq)+4H_(2)O(l),` `E^(@)=+1.52V` ii) `Mn^(7+)(aq)+4H^(+)+3erarrMnO_(2)(s)+2H_(2)O(l),` `E^(@)=+2.26V` iii) `Mn^(7+)(aq)+2erarrMn^(5+)(aq),` `E^(@)=+0.56V("acid med.")` `Mn^(3+)+erarrMn^(2+)`, `E^(@)=+1.51V("acil med.")` v) `Mn^(4+)+erarrMn^(3+),` `E^(@)=+0.95V("acid med.")` Which is the least stable oxidation state of Mn?A. `Mn^(2+)`B. `Mn^(4+)`C. `Mn^(7+)`D. `Mn^(6+)` |
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Answer» Correct Answer - C The three case `Mn^(+7)` dissociates to give `Mn^(2+),Mn^(4+)` and `Mn^(5+)` respectively, Thus it is least stable. |
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