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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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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+) ?

NCERT TELUGU-THE D - ANd F - BLOCK ELEMENTS-Exercises
  1. Why is the E^(ɵ) value for the Mn^(3+)//Mn^(2+) couple much more posit...

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  2. Write down the electronic configuration of : {:("(i) "Cr^(3+),"(iii)...

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  3. Why are Mn^(2+) compounds more stable than Fe^(2+) towards oxidation t...

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  4. Explain briefly how +2 state becomes more and more stable in the first...

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  5. To what extent do the electronic configurations decide the stability o...

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  6. What may be the stable oxidation state of the transition element with ...

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  7. Name the oxometal anions of the first series of transition metals in w...

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  8. What is lanthanoid contraction ? What are the consequences of lanthano...

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  9. What are the characteristics of the transition elements and why are th...

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  10. In what way is the electronic configuration of transition elements dif...

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  11. What are the different oxidation states exhibited by the lanthanoids ?

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  12. Explain giving reasons : Transition metals and many of their compoun...

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  13. What are interstitial compounds ? How are they formed ? Give two examp...

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  14. How is the variability in oxidation states of transition metals differ...

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  15. What is the effect of increasing pH on a solution of potassium dichrom...

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  16. Describe the oxidising action of potassium dichromate and write the io...

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  17. Describe the preparation of potassium permanganate.

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  18. For M^(2+)//M and M^(3+)//M^(2+) systems the E^(Theta) values for some...

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  19. Predict which of the following will be coloured in aqueous solution? T...

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  20. Compare the stability of + 2 oxidation state of the elements of the fi...

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  21. Compare the chemistry of the actinoids with that of lanthanoids with r...

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