1.

Which of the following reactions are disproportionation reactions? `(A)" " Cu^(+)rarrCu^(2+)+Cu` `(B)" "3 MnO_(4)^(2-)+4H^(+)rarr2MnO_(4)^(-)+MnO_(2)+2H_(2)O` `(C )" "2KMnO_(4)rarrK_(2)MnO_(4)+MnO_(2)+O_(2)` `(D)" "2MnO_(4)^(-)+3Mn^(2+)+2H_(2)O rarr5MnO_(2)+4H^(+)`A. (i),(iii)B. (i),(ii),(iiii)C. (ii),(iii),(iv)D. (i),(iv)

Answer» Correct Answer - B
(b) (i) `[overset(+1)(Cu)]^(+) to [overset(+2)(Cu)]^(2+)+ [overset(0)(Cu)]`
(ii) `overset(+6)(3MnO_(4)^(2-))+4H^(+) to overset(+7)(2MnO_(4)^(-))+ overset(+4)(MnO_(2))+2H_(2)O`
(iii) `overset(+7)(2KMnO_(4)) to overset(+6)(K_(2)MnO_(4))+overset(+4)(MnO_(2))+O_(2)`


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