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Why do Mn, Ni and Zn exhibit more negati...

Why do Mn, Ni and Zn exhibit more negative `E^(Theta)` values than expected ?

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`E^(0)` values of Mn, Ni and Zn are more negative than expected from general trend. This is due to the stabilities of half filled d-subshell `(d^(5))" in "Mn^(+2)` and completely filled d-subshell `(d^(10))` in Zinc. For Nickel `E^(0)` value is related to the highest negative enthalpy of hydration.
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-D AND F- BLOCK ELEMENTS AND CO-ORDINATION COMPOUNDS -VERY SHORT ANSWER QUESTIONS
  1. How do rou expect the density of transition elements to vary in a give...

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  2. How do the atomic and ionic sizes vary among transition metals in a gi...

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  3. Why do Mn, Ni and Zn exhibit more negative E^(Theta) values than expec...

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  4. Among the first transition series (3d series) only copper has positive...

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  5. Cu^(+2) forms halides like CuF(2), CuCl(2) and CuBr(2) but not CuI(2)....

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  6. The highest Mn fluoride is MnF(4) where as the highest oxide is Mn(2)O...

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  7. In its fluoride or Oxide, in which a transition metal exhibits highest...

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  8. Why Zn^(2+) is diamagnetic whereas Mn^(2+) is paramagnetic ?

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  9. Write 'spin only' formula to calculate the magnetic moment of transiti...

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  10. Calculate the 'spin only' magnetic moment of Fe(aq)^(2+) ion.

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  11. What is meant by 'disproportionation' ? Give an example of disproporti...

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  12. Aqueous Cu^(2+) ions are blue in colour, where as Aqueous Zn^(2+) ions...

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  13. What are complex compounds ? Give examples.

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  14. Why do the transition metals forin a large number of complex compounds...

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  15. How do transition metals exhibit catalytic activity?

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  16. Give two reactions in which transition metals or their compounds acts ...

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  17. What is an alloy ? Give example.

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  18. Why do the transition metals readily form alloys ?

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  19. How do the ionic character and acidic nature vary among the oxides of ...

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

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