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

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

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One of the main factors that contributes to standard potential is ionisation enthalpy. Third ionisation energy of Mn is very high due to the greater stability of `Mn^(2+)` ion. Thus `E_(Mn^(3+)//Mn^(2+))^(0)` value is more positive.
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For M^(2+)//M and M^(3+)//M^(2+) systems the E^(Theta) values for some metals are as follows: {:(Cr^(2+)//Cr,-0.9V" "Cr^(3)//Cr^(2+),-0.4V),(Mn^(2+)//Mn,-1.2V" "Mn^(3+)//Mn^(2+),+1.5V),(Fe^(2+)//Fe,-0.4" "Fe^(3+)//Fe^(2+),+0.8V):} Use this data to comment upon: (i) the stability of Fe3+ in acid solution as compared to that of Cr3+ or Mn3+ and (ii) the ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.

Explain why Mn^(2+) is more stable than Mn^(3+) ?

AAKASH SERIES-D - BLOCK ELEMENTS-PRACTICE EXERCISE
  1. Why is the E^(ɵ) value for the Mn^(3+)//Mn^(2+) couple much more posit...

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  2. Which of the following element has high density

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  3. Element with pseudooctet configuration in its outermost shell

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  4. The atomic number of element having pseudo inert gas configuration in ...

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  5. Which of the following ion has three unpaired d-electrons

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  6. Number of electrons present in the outer most shell of Cut ion

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  7. Highest oxidation state exhibited by a 3d-metal is

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  8. The highest oxidation state is exhibited by the transition metal with ...

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  9. Hydrated Cu^(2+) ions absorb light of ..... colour and transmit light ...

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  10. The colour of [Ti(H(2)O)(6)]^(3+) is due to

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  11. Complementary colour of green light of wavelength 5000 A^(@) is

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  12. A transitional metal X^(+2) in its hydrated state has six 3d electrons...

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  13. Magnetic moment of which of the following is zero

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  14. The magnetic moment of an ion in its +3 oxidation state is 3.85 BM. Th...

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  15. Common oxidation states of copper in its compounds are

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  16. The ion with highest magnetic moment is

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  17. The highest degree of paramagnetism is shown by

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  18. M^(x+) ion has magnetic moment 2.84 BM. Then 'x' is (Z of M = 23)

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  19. Magnetic moment of Mn^(+2) is 5.8 B.M. Hence the number of unpaired el...

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  20. Reagent used to reduce NO(3)^(-) to NH(3)

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  21. The common metal present in German Silver, Bell metal and Brass is

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