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E^(Theta) value for the couple Cr^(3+)//...

`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.

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.

Text Solution

Verified by Experts

The correct Answer is:
A
`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.
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