Assertion : $Z r$ and $H f$ occur together in nature and are difficult to separate. Reason: $Z r$ and $H f$ have identical radii due to lanthanide contraction.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Zirconium belongs to 4d transaction series and Hafnium belongs to 5d transaction series but they show similarity in physical and chemical properties because of similar atomic radius arising because of lanthanoid contraction.

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

Assertion : $Z r$ and $H f$ occur together in nature and are difficult to separate. Reason: $Z r$ and $H f$ have identical radii due to lanthanide contraction.