Assertion :Alkali metals have least value of ionisation energy within a period. Reason: They precedes halogens in periodic table.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The IE value increases along the period toward right hence the alkali metals have least IE. The alkali metals also precede the halogens in the periodic table. Thus assertion and reason is true but reason does not explain assertion.

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