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Name the lanthanoid element which exhibi...

Name the lanthanoid element which exhibits a +4 oxidation state besides +3 oxidation state.

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Cerium shows +3 as well as +4 oxidation state.
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U-LIKE SERIES-THE D-AND F-BLOCK ELEMENTS -VERY SHORT ANSWER QUESTIONS (1 mark each)
  1. Why is third ionisation energy of manganese [Atomic number = 25] unexp...

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  2. Why is electronic configuration 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d...

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  3. Name the lanthanoid element which exhibits a +4 oxidation state beside...

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  4. What is the difference between the electronic configurations of lantha...

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  5. State a consequence of lanthanoid contraction shown by transition elem...

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  6. Why is that orange solution of K(2)Cr(2)O(7) turns yellow on adding N...

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  7. Why do most transition metal ions show variable oxidation states ?

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  8. Why is Ce^(4+) in aqueous solution a good oxidising agent?

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  9. One unpaired electron in atom contributes a magnetic moment of 1.1 BM....

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  10. Why do Zr and Hf exhibit similar properties?

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  11. Name one ore of manganese and chromium.

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  12. What are the two important oxidation states of Group 6 elements of the...

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  13. In the transition series, with an increase in atomic number, the atomi...

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  14. Write the atomic number of the element in which the filling of 3d subs...

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  15. What is lanthanoid contraction ?

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  16. In permanganate ion, all the bonds between Mn and O are covalent. Give...

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  17. Which is the most stable oxidation state among lanthanoids ?

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  18. State the common characteristic of actinoids and lanthanoids which pla...

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  19. The electronic configuration of an element is 3d^(5) 4s^(2). Write its...

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  20. Why is HCl not used to acidify a permanganate solution in volumetric e...

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