Assertion :Among hydroxides of a alkali metals, LiOH is the weakest base. Reason: Among alkali metals, lithium has the highest ionisation energy.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Among alkali metals, lithium is smallest in size so lithium has the highest ionisation energy and due to this lithium forms weakest base among all alkali metals.

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