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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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One of the main factors that contributes to standard potential is ionisation enthalpy. Third ionisation energy of Mn is very high due to the greater stability of `Mn^(2+)` ion. Thus `E_(Mn^(3+)//Mn^(2+))^(@)` value is more positive.
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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+) ?

AAKASH SERIES-ELEMENTS OF D - BLOCK-EXERCISE - 5.2
  1. Why is the E^(ɵ) value for the Mn^(3+)//Mn^(2+) couple much more posit...

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  2. Give some examples for the ions with pseudo inert gas electronic confi...

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  3. Explain the possible oxidation states of chromium by using electronic ...

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  4. How the maximum and minimum oxidation states of transition elements re...

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  5. What is the oxidation state of central metal in [Ni(CO)(4)] and in [Fe...

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  6. How heat of atomisation changes in 3d-series elements are stable?

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  7. Why copper(I) compounds undergo disproportionation in aqueous solution...

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  8. Transition elements exhibit their highest oxidation states in oxides a...

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  9. Among Fe^(2+) and Cr^(2+), which is stronger reductant? Why?

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  10. Ni^(2+) is more stable than Pt^(2+), but Pt^(4+) is more stable than N...

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  11. Ferrous oxalate is used in developing black and white photographic fil...

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  12. In 3d-series which element has positive E(M^(2+)//M)^(@) value? Why?

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  13. Fe^(3+) can oxidise halide ions. Discuss.

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  14. Why calculated magnetic moment of Co^(2+) is less than the experimenta...

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  15. Mn^(x+) has a magnetic moment of 4.9 BM. Calculate the value of x in t...

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  16. A salt of 3d metal gave a white precipitate with NH(4)OH, but dissolve...

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  17. What is the percentage of number of ferro ions in the non-stoichiometr...

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  18. Addition of appreciable amount KMnO(4) in conc. H(2)SO(4) explodes. Ex...

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  19. An aqueous solution of Al(2)(SO(4))(3),FeSO(4) and chrome alum is heat...

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  20. E^(@) for Mn^(3+), Mn^(2+) is more positive than that for Fe^(3+), Fe^...

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  21. Amongest the bivalent ions of 3d-elements, Mn(II) shows maximum parama...

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