Complete the following :
(i) `Cr_(2)O_(7)^(2-)(aq)+H_(2)S(g)+H^(+)(aq) to `
(ii) `Cu^(2+)(aq) +I^(-)(aq) to `
(iii) `MnO_(4)^(-)+S_(2)O_(3)^(2-)+H_(2)O to `
(iv)`KMnO_(4) overset(heat) to `

Explanation

(i) `Cr_(2)O_(7)^(2-)(aq)+3H_(2)S(g)+8H^(+)((aq) to 2Cr^(3+)(aq)+7H_(2)O(aq)+3S(s)`
(ii) `2Cu^(2+)(aq)+4I^(-) to Cu_(2)I_(2)(s)+I_(2)(s)`
(iii) `3MnO_(4)^(-)+3S_(2)O_(3)^(2-)+H_(2)O to 2OH^(-)+2MnO_(2)+3SO_(4)^(2-)+3S`
(iv)` 2KNMnO_(4) overset(heat) to K_(2)MnO_(4)+MnO_(2)+O_(2)`