Can `Fe^(3+)` oxidises Bromide to bromime under standard conditions ? Given : `E_(Fe^(3+)rfloorFe^(2+))^@=0.771" "E_(Br_2|Br^(-))^@=-1.09V`

Explanation

Required half cell reaction
`2Br^(-)rarrBr^2+2e^(-)" "(E_("ox")^@)=-1.09V`
`2Fe^(3+)+2e^(-)rarr2Fe^(2+)" "(E_("red")^@)=+0.771V`
`2Fe^(3+)+2Br^(-)rarr2Fe^(2+)+Br_2" "(E_("cell")^@)=? `
`E_("cell")^@=(E_("ox")^@)+(E_(red")^@)=-1.09+0.771=-0.319V`
We know that `DeltaG^@=-nFE_("cell")^@`
If `E_("cell")^@" is "-ve, DeltaG` is +ve and the cell reaction is non - spontaneous:
Hene , `Fe^(3+)` cannot oxidise Bromide to Bromine.