Complete the following equations
(i) `Cr_(2) O_(7)^(2-) + 2OH^(-) to`
(ii) `MnO_(4) ^(-) + 4H^(+) + 3e^(-) to `

Explanation

(i) `Cr_(2) O_(7)^(2-) + 2OH^(-) to 2CrO_(4)^(2-) + H_(2) O`
`(ii) MnO_(4) + 4H^(+) 3e^(-) to MnO_(2)+ 2H_(2)O`