Question

Complete the following chemical equations :
(i) `Cr_(2)O_(7)^(-) + H^(+) + I^(-) rarr`
(ii) `MnO_(4)^(-) + NO_(2)^(-) + H^(+) rarr`

Answer 1

(i) `Cr_(2)O_(7)^(+) + H^(+) + 6I^(-) rarr 2Cr^(3+) + 7H_(2)O 2I^(-) rarr I_(2) + 2e^(-) xx 3`
`overline(underline(Cr_(2)O_(7)^(2-)+6I^(-)+14H^(+)rarr2Cr^(3+)+3I_(2)+7H_(2)O`
(ii) `2MnO_(4)^(-) + 5NO_(2)^(+) + 6H^(+) rarr 2 Mn^(2+) + 5NO_(2)^(-) + 3H_(2)O`