Write correctly the balanced half reactions and the overall equations for the following skeletal equations
`(i)NO_(3)^(-)+Bi^(3+)+NO_(2)`
`(ii)Fe(OH)_(2)+H_(2)O_(2)rarrFe(OH)_(3)+H_(2)O`
`Cr_(2)O_(7)^(2-)+C_(2)H_(4)OrarrC_(2)H_(4)O_(2)+Cr^(3+)`
`(iv)MnO_(4)^(-)+H_(2)C_(2)O_(4)rarrMn^(2+)+CO_(2)`
`(v) AI+NO_(3)^(-)rarrAI(OH)_(4)^(-)+NH_(3)`
`(vi)CrO_(7)^(2-)+Fe(2+)rarrrFe^(3+)+Cr^(3+)`

Answer

`{:((Bi rarr Bi^(3+)+3e^(-)),([NO_(3)^(-)+2H^(+)+e^(-)rarrNO_(2)+H_(2)O]xx3))/(Bi+3NO_(3)^(-)+6H^(+)rarrBi^(3+)+3NO_(2)+3H_(2)O):}`