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The E^(@) value in respect of the electr...

The `E^(@)` value in respect of the electrodes `(Z=24)`, manganese `(Z=25)` and iron `(Z=26)` are :

`Cr^(3+)//Cr^(2+)=-0.4V,Mn^(3+)//Mn^(2+)=+1.5V`,`Fe^(3+)//Fe^(2)=+0.8V`.

On the basic of the above information compare the feasibilities of further oxidation of their `+2` oxidation states.

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`+2` oxidation state of Mn is mores stable than `+2` oxidation state of Fe which, in turn, is more stable that `+2` oxidation state of `Cr`. So the order of feasibility of further oxidation of `+2` oxidation state is `Cr^(2+)gtFe^(2+)gtMn^(2+)`
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For Mn^(3+)//Mn^(2+) system, the E^(0) values for some metals are as follows: Cr^(3+)//Cr^(2+)(-0.4V) , Mn^(3+)//Mn^(2+) (+1.5V) , Fe^(3+)//Fe^(2+)(+0.8V) . Then the relative stabilities of Fe^(3+), Cr^(3+) and Mn^(3+) is :

For M^(2+)//M and M^(3+)//M^(2+) system, the E^(@) value of some metals are given : Cr^(2+)//Cr=0.9V,Cr^(3+)//Cr^(2+)=-0.4V Mn^(2+)//Mn=1.2V,Mn^(3+)//Mn^(2+)= +1.5 V Fe^(2+)//Fe=0.4 V, Fe^(3+)//Fe^(2+)= +0.8 V Use this data to comment upon : (a) The stability of Fe^(3+) in acid solution as compared to that of Cr^(3+) or Mn^(3+) (b) The ease with which iron can be oxidised as compared to the similar process for either chromium or manganese metal.

Magnetic moment of Cr(Z=24), Mn^+(Z=25) and Fe^(2+)(Z=26) are x,y,z. They are in order

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