Assertion :Separation of lanthanides is very difficult. Reason: Lanthanides differ only with electronic configuration in antipen ultimate shell.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The given assertion is true as the properties of Lanthanide are very much similar. The reason statement is a factual statement and hence is true. However it does not explain assertion. Hence answer is option B.

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