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Although Zr belongs to 4d and Hf belong...

Although Zr belongs to 4d and Hf belongs to 5d transition series, but it is quite difficult to separate them. Why?

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This happens because of lanthanoid contraction. Two elements present in different series but in the same group (4) have almos same size (160 pm for Zr and 159 pm for Hf).
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DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Short Answer type questions.
  1. Why does not copper liberate hydrogen from acids. ?

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

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

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  4. Transition elements show high melting points. Why?

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  5. Out of Cu(2)Cl(2), which is more stable and why ?

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  6. When a brown compound of manganese [A] is treated with HCl, it gives a...

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

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  8. Although flurorine is more electronegative than oxygen, but the abilit...

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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 those of Th, Pa...

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

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  12. Although +3 oxidation stae is thje characteristic oxidation state of ...

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  13. Explain why does colour of KMnO(4) disappear when oxalic acids is adde...

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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 ...

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  17. E^(@) of Cu is +0.34 V while that of Zn is -0.736 V. Explain.

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

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  19. While filling up electron in the atomic orbitals, 4s orbital is filled...

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

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