1.

Which of the following reactions are dispro-portionation reactions ? (i) Cu^(+) rarr Cu^(2+) + Cu (ii) 3MnO_(4)^(2-) + 4H^(+) rarr 2MnO_(4)^(-) + 2H_(2)O (iii) 2KMnO_(4) rarr K_(2)MnO_(4) + MnO_(2) + O_2 (iv) 2MnO_(4)^(-) + 3Mn^(2+) + 2H_(2)O rarr 5MnO_(2) + 4H^+

Answer»

(i),(ii)
(i),(ii),(iii)
(ii),(iii),(iv)
(i),(iv)

SOLUTION :`(i) Cu^(+)` is oxidised to `Cu^(2+)` and REDUCED to Cu.
In (ii), `MnO_(4)^(2-)` ions are oxidised to `MnO_(4)^(-)` and reduced to `MnO_(2)`.


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