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Chemistry · PYQ NEET UG 2021

हिन्दी

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

  1. diagonal relationship
  2. lanthanoid contraction
  3. having similar chemical properties
  4. belonging to same group

Correct answer · Option 2

lanthanoid contraction

Explanation

The close similarity in atomic and ionic radii of Zr and Hf is a consequence of the lanthanoid contraction.
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