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Why do Zr and Hf exhibit similar propert...

Why do Zr and Hf exhibit similar properties ?

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Due to lanthanide contraction.
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Explain the following: (a) Europium (II) is more stable than cerium (II) (b) Zr and Hf exhibit similar properties. ( c) Scandium forms no coloured ions, yet it is regarded as a transition metal.

(a) Why do Zr and Hf have similar properties? (b) What happens when K_2Cr_2O_7 is treated with H_2SO_4 and NaCl solution ? (c) Why do transition metals form alloys easily?

(a). Of the lanthanides, cerium (Z=58) forms a tetrapositive ion, Ce^(4+) in aqueous solution. Why? (b), The +3 oxidation states of lanthanum (Z=57) , gadolinium (Z=64) and lutetium (Z=71) are especially stable. Why? (c). Why Zr and or Nb anbd Ta exhibit similar properties ? (d). Which oiut of the two La(OH)_3 and Lu(OH)_3 , is more basic and why?

Why Zr and Hf or Nb and Ta exhibit similar properties? Or Zirconium (atomic number40) and hafnium number 72) occur together in minerals and they exhibit similar properties. Give reasons.

Why do elements with similar properties occur in the same group?

Isotopes exhibits similar

Beryllium and aluminimum exhibit many properties which are similar . But, the two elements differ in

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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