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Zr(Z=40) and Hf(Z=72) have similar atomi...

Zr(Z=40) and Hf(Z=72) have similar atomic and ionic radii because of:

A

of diagonal relationship

B

of lanthanoid contraction

C

of actinoid contraction

D

both belong to f-block of elements

Text Solution

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The correct Answer is:
B
of lanthanoid contraction
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MODERN PUBLICATION-D AND F-BLOCK ELEMENTS-COMPETITION FILE (MULTIPLE CHOICE QUESTION ((A) MULTIPLE CHOICE QUESTION WITH ONLY ONE CORRECT ANSWER))
  1. The equivalent weight of KMnO(4) in (a) neutral medium, (b) acidic med...

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  2. Which of the following is an acidic oxide ?

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  3. The number of electrons involve in the equation CrO4^(2-)rarrCr2O7^(2...

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  4. The oxidation state of Cr in Cr(2)O(7)^(2-) is

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  5. In strongly alkaline medium, MnO4^- MnO4^(-) + e^(-) to MnO4^(2-) ...

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  6. In acidic medium, equivalent weight of K(2)Cr(2)O(7) (molecular weight...

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  7. (NH(4))(2)Cr(2)O(7) (ammonium dichromate) is used in fire works. The g...

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  8. The number of moles of KMnO(4) that will be needed to react with one m...

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  9. Number of electrons transferred in each case when KMnO(4) acts as an o...

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  10. The basic character of the transition metal monoxide follows the order

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  11. At pH = 11 , Cr2O7^(2-) ion changes to

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  12. Which of the following is the strongest base ?

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  13. Zr(Z=40) and Hf(Z=72) have similar atomic and ionic radii because of:

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  14. The outer electronic configuration of Gd (At.No. 64) is

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  15. Choose the stable oxidation states of cerium (Ce).

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  16. In which of the following pairs, the atomic size is almost the same ?

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  17. The lanthanide contraction is responsible for the fact that

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  18. The electronic configuration of terbium (IV) (At. No. 65) is

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  19. Which of the following statement is not correct?

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  20. The correct order of ionic radii Y^(3+),La^(3+),Eu^(3+) and Lu^(3+) is...

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