`E^(Theta)` value for the couple `Cr^(3+)//Cr^(2+)` and `Mn^(3+)//Mn^(2+)` are `-0.41 and +1.51` volts respectively. Considering these value select the correct option from the following statements.

Options

A. `Cr^(2+)` is a reducing and `Mn^(3+)` is an oxidising agent
B. `Cr^(2+)` is more stable than `Cr^(3+)`
C. `Mn^(3+)` is more stable than `Mn^(2+)`
D. `Cr^(2+)` acts as on oxidising whereas `Mn^(3+)` acts as a reducing agent

Answer

A

Explanation

`Cr^(3+)e^(-)toCr^(2+).E^(@)=-0.41` volts and
`Mn^(3+)+e^(-) to Mn^(2+) E^(@)=+1.51` volts
These values indicate that `Cr^(2+)` is unstable `(`negative reduction potential`)` and would like to axquire more stable `Cr^(3+)` state by acting as a reducing agent. `Mn^(3+)` is unstable and gets reduced to more stable `Mn^(2+)` form.