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Because of lanthanoid contraction, which...

Because of lanthanoid contraction, which of the folliwng pairs of elements have nearly same atomic radii ? (Numbers in the paren thesis are atomic numbers)

A

Zr(40) and Hf(72)

B

Zr(40) and Ta(73)

C

Ti(22) and Zr(40)

D

Zr(40) and Nb(41)

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The correct Answer is:
A
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AAKASH SERIES-D-BLOCK ELEMENTS-OBJECTIVE EXERCISE-3 (PREVIOUS NEET/AIPMT QUESTIONS)
  1. Which one of the following does not correctly represent the correct or...

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  2. Four successive members of the first series of the transition metals a...

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  3. Catalytic activity of transition elements and their compounds is due t...

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  4. Which of the following exhibits only +3 oxidation state ?

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  5. Which of the following does not give oxygen on heating?

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  6. Which of the following lanthanoid ions is diamagnetic ?

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  7. Identify the correct order of solubility of Na(2)S, CuS and ZnS in aqu...

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  8. The reaction of aqueous KMnO(4) with H(2)O(2) in acidic conditions giv...

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  9. Magnetic moment 2.83 BM is given by which of the following ions ?

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  10. Reason of lanthanodi contraction is

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  11. Magnetic moment 2.84B.M. is given by (Atomic number, Ni = 28, Ti = 22,...

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  12. Which of the following processes does not involve oxidation of iron ?

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  13. Because of lanthanoid contraction, which of the folliwng pairs of elem...

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  14. Assuming complete ionisation, same moles of which of the following com...

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  15. Gadolinium belongs to 4f series. Its atomic number is 64. Which of the...

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  16. The electronic configurations of Eu (Atomic No. 63), Gd (Atomic No. 64...

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  17. Which one of the following statements related to lanthanons is incorre...

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  18. The reason for greater range of oxidation states in actinoids is attri...

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  19. Match the metal ions given in Column I with the spin magnetic moments ...

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  20. Which one of the following ions exhibits d-d tranistion and paramagnet...

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