Verified Solution • 2025–26 Session moderate

QJEEM05Chaee6: JEE Main 2005 Chemistry - Class 12 JEEM05Chaee6 Solution: The lanthanide contraction is responsible for the fact that :

The lanthanide contraction is responsible for the fact that :

Multiple Choice Options

  • A Zr and Y have about the same radius
  • B Zr and Nb have similar oxidation state
  • C Zr and Hf have about the same radius
  • D Zr and Zn have the same oxidation

Step-by-Step Verified Solution

AIEEE 2005 Chemistry - d and f Block Elements Question 204 English Explanation
In the entire d-block,

Only in group 3, the size increase from top to bottom due to increase of no of shells in an atom. That is why size of Sc < Y < La. And shell size in group 3 is 3d < 4d < 5d.

But from group 4 to 12, the size of 3d < 4d but 4d ≅\cong 5d due to lanthanide contraction. That is why Zr and Hf have about the same radius.

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