Write redox couples involved in the reactions (a) to (d) given in quesiton 34.

Explanation

Given that,
`Cu+Zn^(2+)toCu^(2+)+Zn`
`Mg+Fe^(2+)toMg^(2+)+Fe`
`Br_(2)+2Cl^(-)toCl_(2)+2Br`
`Fe+Cd^(2+)toCd+Fe^(2+)`
(a) `Cu^(2+)//Cu` and `Zn^(*2+)//Zn``" "`(b)`Mg^(2+)//Mg` and `Fe^(2+)//Fe`
( c) `Br_(2)//Br^(-)` and `Cl_(2)//Cl^(-)``" "`(d) `Fe^(2+)//Fe` and `Cd^(2+)//Cd`