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Although (+3) oxidation states is the ch...

Although (+3) oxidation states is the characteristic oxidation state of lanthanoids but cerium shows (+4) oxidation state also. Why?

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In (+4) oxidation state, a noble gas configuration `[Xe] 4f^(0) 5d^(0) 6s^(0)` is attained
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KUMAR PRAKASHAN-THE D-AND F-BLOCK ELMENTS-Section D (Short Answer Type Questions
  1. Why does copper not replace hydrogen from acids?

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

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  3. Why first ionisation enthalpy of Cr is lower than that of Zn?

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  4. Transition elements show high melting points. Why?

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  5. When Cu^(2+) ion is treated with KI, a while precipitate is formed. Ex...

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

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

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

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

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  10. Ionisation enthalpies of Ce, Pr and Nd are higher than Th, Pa and U. W...

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

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  12. Although (+3) oxidation states is the characteristic oxidation state o...

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  13. Explain why does colour of KMnO(4) disappear when oxalic acid is added...

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  14. When orange solution containing Cr(2)O(7)^(2-) ion is treated with an ...

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  15. A solution of KMnO(4) on reduction yields either a colourless solution...

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

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

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

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  19. While filling up of electrons in the atomic orbitals, the 4s orbital i...

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

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