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

Options

A. `Cr^(2+)` acts as a reducing agent and `Mn^(3+)` acts as an oxidising agent in their aqueous solutions.
B. `Cr^(2+)` (aq). Is more stable than `Cr^(3+)(aq.)`
C. `Mn^(3+)(aq)` is more stable than `Mn^(2+)(aq.)`
D. None of these.

Answer

A

Explanation

`Cr^(3+)+e^(-)toCr^(2+),E^(Theta)=-0.41` votls and `Mn^(3+)+e^(-)toMn^(2+)+E^(Theta)=+1.51`volts
this shows that `Cr^(2+)` is unstable and has a tendency to acquire more stable `Cr^(3+)` state by acting as a reducing agent. On the other hand `Mn^(3+)` is unstable and is reduced to more stable `Mn^(2+)` state.