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Zr and Hf have identical sizes. Elaborat...

Zr and Hf have identical sizes. Elaborate.

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Both Zr and Hf are present in group 4 (d-block). The atomic radius of Zr (160 pm) is quite close to that of Hf (159 pm). Actually, Hf experiences lanthanoid contraction which causes a decrease in its atomic size and atomic radius. Therefore, the two elements have identical sizes.
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Assertion : Zr and Hf occur together in nature andare difficult to separate. Reason : Zr and Hf have identical radii due to lanthanide contraction.

Enantiomers have identical

(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?

How would you account for the following? (l) Transition metals exhibit variable oxidation states. (ii) Zr (Z = 40) and Hf (Z = 72) have almost identical radii. (iii) Transition metals and their compounds act as catalyst.

DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Additional Important Question
  1. Copper (I) is diamagnetic while copper (II) is paramagnetic . Explain...

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  2. Zn^(2+) salt are white while Cu^(2+) salts are blue. Assign reason.

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  3. Out of Fe^(2+) and Fe^(3+) ions, which is more stable ?

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  4. Anhydrous ferric chloride is prepared by:

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  5. On the basis of the standard electroe potential values stated for acid...

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  6. Whys is chemistry of all lanthaoids identical ?

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  7. The element scandium (Z=21) does not exhibit variable oxidation state ...

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  8. Why is the E^(Theta) value for the Mn^(3+)//Mn^(2+) couple much postiv...

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  9. With 3d^(4) configuration, Cr^(2+) acts as a reducing agent but Mn^(3+...

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  10. One among the lanthanoides, Ce(III), can be easily oxidized to Ce(IV) ...

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  11. Copper (I) is diamagnetic while copper (II) is paramagnetic . Explain...

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  12. Why do chromium group elements have the highest melting point in their...

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  13. Why do transition metals form coloured complexes ?

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  14. Among transition metals, the highest oxidation state is exhibited in o...

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  15. Ce^(4+) is used as an oxidising agent in volumetric analysis. Why ?

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  16. Zn^(2+) salt are white while Cu^(2+) salts are blue. Assign reason.

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  17. Zr and Hf have identical sizes. Elaborate.

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  18. The lowest oxidation state of manganese is basic while the highest is ...

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  19. Mn(II) shows maximum paramagnetic character amongst the divalent ions...

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  20. Give reason for the folloiwng : (a) E("value")^(@) for Mn^(3+)//Mn^(...

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