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NEETChemistryd and f Block Elements

What is the primary reason for the difficulty in separating Zr and Hf in nature?

Options

  1. ATheir different chemical reactivity
  2. BTheir identical atomic numbers
  3. CTheir almost identical radii
  4. DTheir abundance in nature

Correct answer

C. Their almost identical radii

Step-by-step solution

The almost identical radii of Zr (160 pm) and Hf (159 pm), a consequence of the lanthanoid contraction, account for their occurrence together in nature and for the difficulty faced in their separation

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