Complete the following reactions :
(i) `Cr_(2)O_(7)^(2-)+Sn^(2+)+H^(+) to `
(ii) `MnO_(4)^(-)+Fe^(2+)+H^(+) to `

Explanation

`(i) Cr_2O_7^(2-) + 3Sn^(2+) + 14H^(+) to 2Cr^(3+) + 3Sn^(4+) + 7H_2O`
`(ii) MnO_4^(-) + 5Fe^(2+) + 8H^(+) to Mn^(2+) + 5Fe^(3+) + 4H_2O`