Predict whether reaction will occur between the pairs given below :
`Sn^(2+)and Fe^(3+)`
`[" Given "E_(Fe^(3+)|Fe^(2+))=+0.77 V , E_((1/2)I_(2)|I^(-))=+0.54 V, E_(Ag^(+)|Ag)^(@)=+0.79 V and E_((Sn)^(4+)|Sn^(2+))^(@)=+0.15 V ] `

Explanation

We know (i) a redox couple with higher standard reduction potential `(E^(@))` is a stronger oxidising agent than the one of with a lower `(E^(@))` , Conversely a redox couple with a lower `E^(@)` is a stronger reducing agent than the one with a higher `E^(@)` is a stronger oxidising and reducing agents react spomtaneously to form weaker oxidising and reducing agents .
As `E_(Fe^(3+)|Fe^(2+))^(@)gtE_(Sn^(4+)|Sn^(2+))^(@), Fe^(3+)` is a stronger reducing agent than `Fe^(2+)` Hence , `Fe^(3+)` and `Sn^(2+)` will react spontaneously inder standard conditions to form `Fe^(2+)` and `Sn^(4+)`
`2Fe^(3+)(aq)+Sn^(2)(aq)to 2Fe^(2+)(aq)+Sn^(4+)(aq)`