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Why E^(@) values for Mn, Ni and Zn are m...

Why `E^(@)` values for Mn, Ni and Zn are more negative than expected ?

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Negative values for `Mn^(2+)` and `Zn^(2+)` are related to the stabilities of half-filled and fully filled configurations respectively.
For `Ni^(2+),E^(@)` value is related to the highest negative enthalpy of hydration.
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Why E^(@) value of Mn, Ni and Zn are more negative than expected ?

Give reasons for the following: (i) Transition elements and their compounds act as catalysts (ii) E^(@) value for (Mn^(2+) | Mn) is negative whereas for (Cu^(2+) | Cu) is positive. (iii) Actinoids show irregularities in their electronic configuration.

Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first? Justify your answer.

Would you expect the second electron gain enthalpy of S as positive, more negative or less negative than the first? Justify your answer.

Density of Mn is more/ less than Fe.

Wxplain why E^(@) for Mn^(3+)//Mn^(2+) couple is more positive than that for Fe^(3+)//Fe^(2+) (At. Nos. Mn=25,Fe=26)?

U-LIKE SERIES-THE D-AND F-BLOCK ELEMENTS -SHORT ANSWER QUESTIONS (2 marks each)
  1. A mixed oxide of iron and chromium FeO.Cr(2)O(3) is fused with sodium ...

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  2. Complete the following reactions : (a) (NH(4))(2)Cr(2)O(7)overset(He...

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  3. Why E^(@) values for Mn, Ni and Zn are more negative than expected ?

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  4. Out of Cu(2)Cl(2) and CuCl(2), which is more stable and why ?

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  5. Although fluorine is more electronegative than oxygen, but the ability...

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  6. Transition metals show high melting points. Why?

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  7. When Cu^(2+) is treated with KI, a white precipitate is formed. Explai...

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  8. When a brown compound of manganese (A) is treated with HCl it gives a ...

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  9. Explain why (i) E^(@) for Mn^(3+)//Mn^(2+) couple is more positive t...

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  10. With the help of ionic equations, describe what happens when (i) pH ...

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  11. Although Zr belongs to 4d and Hf belongs to 5d transition series, but ...

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  12. The outer electronic configurations of two transition metals are (i) 3...

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  13. The second and third rows of transition elements resemble each other m...

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  14. Although Cr^(3+) and Co^(2+) ions have the same number of unpaired ele...

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  15. Although +3 oxidation state is the characteristic oxidation state of l...

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  16. When orange solution containing CrO(7)^(2-) ion is treated with an alk...

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  17. Explain why does the colour of KMnO(4) disappear when oxalic acid is a...

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  18. E^(@) of Cu is + 0.34 V while that of Zn is – 0.76 V. Explain.

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  19. The halides of transition elements become more covalent with increasin...

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  20. Reactivity of transition elements decreases almost regularly from Sc t...

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