Assertion: Oxygen has higher ionization energy than fluorine.
Reason: Fluorine has high electron affinity than nitrogen causing the loss of electrons easier.

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Both assertion and reason are correct, and the reason is the correct explanation for assertion.

Both assertion and reason are correct, but the reason is not the correct explanation for assertion.

The assertion is correct, but the reason is incorrect

Both assertion and reason are incorrect

answer is D.

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Detailed Solution

Fluorine has higher ionisation energy than nitrogen because of its small size due to which effective nuclear charge is very high hence losing an electron requires a lot of energy. Due to its high electron affinity and non-metallic character, it has higher ionisation energy than nitrogen.

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