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Because of lanthanoide contraction, whic...

Because of lanthanoide contraction, which of the following pairs of elements have nearly same atomic radii ?
(Numbers in the parenthesis are atomic numbers )

A

Ti (22) and Zr (40)

B

Zr (40) and Nb (41)

C

Zr (40) and Hf (72)

D

Zr (40) and Ta (73)

Text Solution

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The correct Answer is:
C
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NIKITA PUBLICATION-D-AND F-BLOCK ELEMENTS-MULTIPLE CHOICE QUESTIONS
  1. Lanthanide contraction is due to increase in

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  2. The correct order of ionic radius of Yb ^(3+), La ^(3+) , Eu ^(3+), Lu...

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  3. Because of lanthanoide contraction, which of the following pairs of el...

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  4. A raduction of atomic size with increase in atomic number is a charact...

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  5. As increase in both atomic and ionic radii with atomic number occurs i...

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  6. The lanthanide contraction is responsible for the fact that

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  7. Tantalum and nobonium have sinmilar ionic radii because

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  8. The properties of 3 ^(rd) transition series elements and 2^(nd) transi...

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  9. The properties of tungsten and molybdenum are sinmilar because

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  10. Which of the following pair of atoms have similar

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  11. Which of the following is more basic hydroxide ?

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  12. Which of the following is more ionic hydroxide ?

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  13. Which of the following Ln^(3+) ion is strongest raducing agent ?

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  14. Which of the following is chemical twins ?

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  15. Lanthanide contraction due to

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  16. Which of the following hydroxide has more covalent character ?

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  17. Decreasing order of ionic character of Ln (OH0(3) is

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  18. Which of the following f-block element are not able to oxocations ?

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  19. Actinide from

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  20. Among the following strongest base is

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