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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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Much larger third ionisation energy of Mn (change from `3d^(5)` to `3d^(4)`) is responsible for hits. 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 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 & F-BLOCK ELEMENTS & THEIR IMPORTANT COMPOUNDS -Exercise 1
  1. What is the most common oxidation state of first transtion series.?

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

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

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

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  6. Why Ti^(+4) complexes are diamagnetic?

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  7. A substance is found to have a magnetic moments of 3.9BM.How many unpa...

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  8. Explain giving reason: (a) Transition metals and many of their compo...

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  9. Describe the general characteristics of transition elements with speci...

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  10. Which type of reaction MnO(4)^(2-) shows with aid, dilute-alkali or wa...

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  11. Why KMnO(4) is stored in dark bottle and water happens to it's aidic s...

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  12. Why does AgNO(3) produce a black stain on the skin?

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  13. Why is AgBr used in photography?

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  14. Why it is not advisable KMnO(4) in cold and concentrated H(2)SO(4)?

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  15. What happens when: (a). Green vitriol is strongly heated. (b). Mal...

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  16. State true or false: Reaction of K(2)Cr(2)O(7) with cold and concentra...

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  17. Write balaned chemical equations for: (i) Mixture of K(2)Cr(2)O(7) a...

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  18. What are inner-transition elements? Decide which of the following atom...

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  19. Actinoid contraction is greater from element to element than lanthanoi...

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  20. The chemistry of the actinoid elements is not so smooth as that of the...

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