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Although +3 oxidation state is the chara...

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

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The electronic configuration of Ce is `-4f^(1)5d^(1)6s^(2)`. Usually `5d^(1)` and `6s^(2)` electrons are lost by the lanthanoids in their reactions i.e., they exhibit +3 oxidation states. But Ce exhibit +4 oxidation state also because it gains extra stability by losing `4f^(1)` electron because it will give rise to completely filled orbitals.
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U-LIKE SERIES-THE D-AND F-BLOCK ELEMENTS -SHORT ANSWER QUESTIONS (2 marks each)
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  7. Although Cr^(3+) and Co^(2+) ions have the same number of unpaired ele...

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

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

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

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

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  18. While filling up of the electrons in the atomic orbitals, the 4s orbit...

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  19. Write complete equations for (i) Oxidation of Fe^(2+) by Cr(2)O(7)^(...

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