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Why is the E^(ɵ) value for the Mn^(3+)//...

Why is the `E^(ɵ)` value for the `Mn^(3+)//Mn^(2+)` couple much more position than that for `Cr^(3+)//Cr^(2+)" or "Fe^(3+)//Fe^(2+)` ? Explain.

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Much larger third ionisation energy of Mn (where the required change is `d^(5)" to "d^(4))` is mainly responsible for this. This also explains why the +3 state of Mn is of little importance.
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E^(@) for Mn^(3+), Mn^(2+) is more positive than that for Fe^(3+), Fe^(2+) , Why?

(A) E^(@) for Mn^(+3)//Mn^(+2) is more positive than Cr^(3+)//Cr^(+2) (R) IP_(3) of Mn is larger than that of Cr.

Radii of iron atom and its ions follow Fe > Fe^(2+) > Fe^(3+) - explain.

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The oxidation state of Cr in [Cr(NH_(3))_(4)Cl_(2)]Cl

For M^(2+)//M and M^(3+)//M^(2+) systems the E^(Theta) values for some metals are as follows: {:(Cr^(2+)//Cr,-0.9V" "Cr^(3)//Cr^(2+),-0.4V),(Mn^(2+)//Mn,-1.2V" "Mn^(3+)//Mn^(2+),+1.5V),(Fe^(2+)//Fe,-0.4" "Fe^(3+)//Fe^(2+),+0.8V):} Use this data to comment upon: (i) the stability of Fe3+ in acid solution as compared to that of Cr3+ or Mn3+ and (ii) the ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.

Explain why Mn^(2+) is more stable than Mn^(3+) ?

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