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Why is the value for (Mn^(3+))/(Mn^(2+))...

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

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The correct Answer is:
Much larger third ionisation energy of `Mn` (change from 3d^(5) to 3d^(4)`) is responsible for this. This also explains why the `+3` state of `Mn` is of little importance
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Why is the E^(Theta) value for the Mn^(3+)//Mn^(2+) couple much more positive than that for Cr^(3+)//Cr^(2+) or Fe^(3+)//Fe^(2+)

(a) why is the E^(Theta) value for the Mn^(3+)//Mn^(2+) couple much more positivethan that for Cr^(3+)//Cr^(2+) or Fe^(3+) // Fe^(2+) ? Explain. (b) What is meant by 'disproportionation' of an oxidation state? Give example.

S_(1) : Mn^(2+) compounds more stable than Fe^(2+) towards oxidation to their +3 state. S_(2) : Titanium and copper both in the first series of transition metals exhibits +1 oxidation state most frequently. S_(3) : Cu^(+) ions is stable in aqueous solutions. S_(4) : The E^(0) value for the Mn^(3+)//Mn^(2+) couple much more positive than that for Cr^(3+)//Cr^(2+) or Fe^(3+)//Fe^(2+) ,

Why is the E^(Theta) value for the Mn^(3+)//Mn^(2+) couple much postive than for Cr^(3+)//Cr^(2+) or Fe^(3+)//Fe^(2+) ? Example

How would you account for the following? (i)The atomic radii of the metals of the third (5d) series of trasition elements are virtually the same as those of the corresponding members of the second (4d) series. (ii)The E^(@) value for the Mn^(3+)//Mn^(2+) couple is much more positive than that for Cr^(3+)//Cr^(2+) couple or Fe^(3+)//Fe^(2+) couple. (iii)The highest oxidation state of a metal is exhibited in itsoxide or fluoride.

How would you account for the following? (i) The atomic radii of the metals of the third (5d) series of transition elements are virtually the same as those of the corresponding member of the second (4d) serie (ii) The E^(@) value for the Mn^(3+)//Mn^(2+) couple is much more positive than that for Cr^(3+)//Cr^(2+) couple of Fe^(3+)//Fe^(2+) couple. (iii) The highest oxidation state of a metal is exhibited in its oxides or fluoride.

E_(Mn^(3+)//Mn^(2+))^@ is highly positive than that of E_(Cr^(3+)//Cr^(2+))^@orE_(Fe^(3+)//Fe^(2+))^@ because

RESONANCE-D BLOCK ELEMENTS-EXERCISE-I PART-I
  1. What is meant by disproportionation of an oxidation state ? Give an e...

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  2. Name the three factors which determine the stability of a particular ...

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  3. Why is the value for (Mn^(3+))/(Mn^(2+)) couple much more positive tha...

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  4. Most of transition , metals can display hydrogen from dilute acid. Why...

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  5. {:("Element",Cr,Mn,Fe),(E^(0)(M^(2+)//M),-0.90V,-1.18V,-0.4V),(E^(0)(M...

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  6. Which of the following ions would form (i) coloured and (ii) colourles...

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  7. Why Ti^(4) complex are diamagnetic?

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  8. A substance is found to hav a magnetic moments of 3.9BM.How many unpai...

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  9. Why do Mn(II) show maximum paramagnetic character amongst the bivalent...

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  10. Explain gives reason. (a) Transition metal and many of their compoun...

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  11. Explain why transition metals and their many compounds act as goodd ca...

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  12. A transition metal form alloys with other transition elements . Explai...

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  13. Describe The general characteristics of transition elements with speci...

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  14. What happen when CuSO(4) solution is treated with (excess of ammonia...

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  15. What happen when silver nitrate solution is added to Na(2)S(2)O(3) sol...

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  16. What reaction will take place if a silver coin is put in dilute HNO(3)...

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  17. Which type of reaction MnO(4)^(2-)show with acid , dilute -alkali or w...

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  18. Why KMO(4) is stored in dark bottle and what happens to it's acidic so...

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  19. Why does AgNO(3) produced a black stain on the skin?

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  20. Why is AgBr used in photography ?

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