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

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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Due to lanthanide contraction Zr (4d - element of group 4) and Hf (5d - element of group 4) have almost the same size (160 pm and 159 pm, respectively). So in the same oxidation state they have the same charge to radius ratio and hence, similar physical and chemical properties.
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CHHAYA PUBLICATION-D - AND F - BLOCK ELEMENTS -SOLVED NCERT EXEMPLAR PROBLEMS (Short Answer Type)
  1. Why does copper not replace hydrogen from acids ?

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  2. Why E^(0) values for Mn, Ni and Zn are more negative than expected ?

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

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  4. Transition elements show high melting points. Why ?

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

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

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  7. When a brown compound of manganese (A) is treated with HCl it gives a ...

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  8. Although fluorine is more electronegative than oxygen, but the ability...

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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 Th, Pa and U. W...

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

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

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

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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 m...

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  17. E^(0) of Cu is +0.34 V while that of Zn is -0.76V. Explain.

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

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  19. While filling up of electrons in the atomic orbitals, the 4s-orbital i...

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

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