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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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`Mn^(+2)` contains stable `d^(5)` configuration. So removal of another electron from exactly half-flled configuration requires more energy i.e., greater third IE of manganese is responsible for the variation.
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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.

NARAYNA-D BLOCK & TRANSITION ELEMENTS-Level-VI (H.W)
  1. Why is the E^(Theta) value for the Mn^(3+)//Mn^(2+) couple much postiv...

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  2. Generally transition elements from coloured salts due to the presence ...

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  3. Which of the following is amphoteric oxide? Mn(2)O(7),CrO(3),Cr(2)O(...

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  4. Interstitial compounds are formed when small atoms are trapped inside ...

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  5. Higher oxidation state of manganese in fluoride is +4 (MnF(4)) but hig...

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  6. Although zirconium belongs to 4d transition series and hafnium to 5d t...

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  7. Although Cr^(3+) and Co^(2+) ions have same number of unpaired electro...

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  8. The aqueous solution of transition metal salt changes colour from pink...

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  9. While Fe^(3+) is stable Mn^(3+) is not stable in acitic solution becau...

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  10. Which of the following transition metal oxides is(normally) neither ac...

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  11. The thermally unstable compounds are

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  12. Which one of the following reactions cannot occur?

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  13. Which of these are liquids at room temperature ?

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  14. The typical acidic oxides are

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  15. The compounds that undergo hydrolysis readily is/are

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  16. Which are the best suitable as coinage metals?

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  17. Paramagnetism is exhibited by :

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  18. In the form of dichromate, Cr(VI) is a strong oxidising agent in acidi...

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  19. The diamagnetic compounds is/are

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  20. The colour of the transition metal ions is due to

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  21. Select the correct statement(s) with respect to oxides and oxoanions o...

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