Heavier halide is oxidised by lighter halogen. Justify. 

Explanation

The oxidation ability of halogens is in the order : `F_(2)gtCl_(2)gtBr_(2)gtI_(2)`.
Lighter halogen is a stroger oxidant .Heavier halide is less stable , acts as a reducing agent and is easily oxidised .
The reaction that is easily possible among halides and halogens is ,
`2I^(-)+F_(2)to2F^(-)+I_(2)`