Balance the chemical reaction :
(i) `overset(+7)MnO_(4)^(-) + 3H_(2) overset(-2)O overset("noutral medium") to overset(+4)MnO_(2) + overset(0)O_(2)`
(ii)Write the balanced equation when ferrous sulphate is treated with acidified `(H_(2)SO_(4))` potassium permanganate .
(iii) Balance the equation `MnO_(4) + C_(2)O_(4) + H^(+) to CO_(2) + Mn^(+2) + H_(2)O`
(iv) Balance the equation `K_(2)Cr_(2)O_(7) + HCl to KCl + CrCl_(3) + H_(2)O + Cl_(2)`

Explanation

(i) ` 2MnO_(4)^(-) + 3H_(2)O to 2MnO_(2) + 3O_(2) + 2OH^(-) + 2H_(2)O`
(ii) `10 FeSO_(4) + 2KMnO_(4) + 8H_(2)SO_(4) to 5Fe_(2)(SO_(4))_(3) + 2MnSO_(4) + K_(2)SO_(4) + H_(2)O`
(iii) `2MnO_(4)^(-) + 5C_(2)O_(4)^(2-) + 16H^(+) to 2Mn^(2+) + 10CO_(2) + 8H_(2)O`
(iv) ` K_(2)Cr_(2)O_(7) + 14HCl to 2KCl + 2CrCl_(3) + 7H_(2)O + 3Cl_(2)`