1. Tardigrade
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  3. Chemistry
  4. Assertion: Zr and Hf occur together in nature and are difficult to separate. Reason: Zr and Hf have identical radii due to lanthanide contraction.

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Q. Assertion : $Zr$ and $Hf$ occur together in nature and are difficult to separate.
Reason : $Zr$ and $Hf$ have identical radii due to lanthanide contraction.

The d-and f-Block Elements

Solution:

Correct answer is (a) If both assertion and reason are true and reason is the correct explanation of assertion