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Write short notes on lanthanoid contract...

Write short notes on lanthanoid contraction ?

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The regular slow decrease in the atomic or ionic radii of lanthanoids with increasing atomic number.
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CBSE COMPLEMENTARY MATERIAL-The d- AND f-BLOCK ELEMENTS-VERY SHORT ANSWER TYPE QUESTION
  1. Which element among 3d series exhibit highest oxidation state ?

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  2. In 3d series (Sc to Zn), Zinc shows the lowest enthalpy of atomization...

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  3. Which element among 3d series exhibit only one oxidation state ?

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  4. Why is the 3rd ionization energy of Mn (Z = 25) is unexpectedly high ?

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  5. Define alloy.

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  6. Transition metals show zero oxidation state with ligands like CO. Expl...

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  7. Why can’t HCl acid be used to acidify KMnO(4) solution ?

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  8. Name one ore of Mn and Cr.

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  9. Why Mn^(2+) compounds are more stable than Fe^(2+) compounds towards o...

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  10. Give reason for the following Transition metal (elements) show variab...

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  11. Write any uses of pyrophoric alloy.

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  12. Which is more basic La (OH)(3) or Lu (OH)(3) ? Why

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  13. Find out number of Cr-O - bond//bonds in CrO(4)^(2-) ion.

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  14. What is the effect of increasing pH on the colour of K(2)Cr(2)O(7) sol...

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  15. Why isCe^(4+) in aqueous solution a good oxidizing agent ?

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  16. Why do Zr and Hf exhibit similar properties ?

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  17. Write short notes on lanthanoid contraction ?

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  18. Why is Cu (Z = 29) considered a transition metal ?

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  19. Arrange the given in increasing order of acidic character : CrO(3) ,...

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  20. Why KMnO(4)or MnO(4)^(-)ion is coloured ?

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