Give an example of oxidation of halide by another halogen. Explain the feasibility of the reaction.

Answer

`2KI(aq.)+Cl_(2) to 2KCl(aq.) + I_(2)`
In the reaction `Cl_(2)` oxidises iodide ion (-1 oxidation state) to `I_(2)` (0 oxidation state).`Cl_(2)` has higher oxidation potential than `I_(2)` and thus oxidises iodide to iodine getting itself reduced to chloride ion. Similarly,
`({:(2l^(-),(aq.),to,I_(2)(s),+,2e^(-)),(Cl_(2),(g),+,2e^(-),to,2Cl^(-),(aq.)):})/(2I^(-)(aq)+Cl_(2)(g)toI_(2)(s)+2Cl^(-)(aq.))`