Complete the following chemical equations :
(i) `MnO_(4)^(-)+C_(2)O_(4)^(2-)+H^(+)to`
(ii) `KMnO_(4)overset("heated")to`
(iii) `Cr_(2)O_(7)^(2-)H_(2)S+H^(+)to`

Explanation

The completed reactions are given as under :
(i) `2MnO_(4)^(-)+5C_(2)O_(4)^(2-)+16H^(+)to2Mn^(2+)+8H_(2)O+10CO_(2)`
(ii)`2KMnO_(4)overset("Heat")to K_(2)MnO_(4)+MnO_(2)+O_(2)`
(iii) `Cr_(2)O_(7)^(2-)+3H_(2)S+14H^(+)to2Cr^(3+)+7H_(2)O+6H^(+)+3S`