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Why is the E^(Theta) value for the Mn^(3...

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

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The correct Answer is:
Much larger third ionisation energy of `Mn` (where the required is `d^(5) to `D^(4)` ) is mainly responsible for this . This also explain 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 value for (Mn^(3+))/(Mn^(2+)) couple much more positive than that for (Cr^(3+))/(Cr^(2+)) or (Fe^(3+))/(Fe^(2+)) ? Explain

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.

RESONANCE-D BLOCK ELEMENTS-EXERCISE-2 PART-I
  1. which metal in the first series of transition metals exhibits +1 oxid...

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  2. The E(Theta)(M^(2+)//M) Value for copper is positive (+0.34V) . What i...

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  3. Why is the E^(Theta) value for the Mn^(3+)//Mn^(2+) couple much postiv...

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  4. Which is a stronger reducing agent Cr^(2+) or Fe^(2+) and why?

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  5. Why is Cu^(+) ion not stable in aqueous solution ? or Why is Cu^(+...

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  6. The aqueous solution of FeCl(3) is acidic . Why?

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  7. Ferric iodide is very unstable but ferric chloride is not

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  8. Copper dissolves in dilute nitrate acid but not in dilute HCl. Why?

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  9. Blue colour of CUSO(4) solution is discharge slowly when an iron rod i...

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  10. Copper (I) Salts are not known in aueous solution.

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  11. Calculate the number of unpaired electrons in the following gaseous io...

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  12. Mercurous ion is written as Hg(2)^(2+) whereas cuprous ion is written ...

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  13. Copper sulphate dissolves in Nh(4)OH solution but FesO(4) does not.

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  14. An aqueous solution of inorganic compounds (X) gives following reactio...

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  15. H(2)S gas is passed through an acidic solution of K(2)Cr(2)O(7) . The ...

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  16. What happen when(i) a small amount of Kmno(4) is added to concentrated...

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  17. A hydrated mettalic salt(A). Light green in colour , on careful heatin...

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  18. A white substance (A) reacts with dilute H(2)SO(4) to produce a colour...

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  19. Write the balanced chemical equation for the following reaction:- Nitr...

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  20. Complete and //balance the following equation: Ag(2)S+CuCl(2)+Hg…………...

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