Assertion (A): The first ionisation energy of nitrogen is greater than that of oxygen.
Reason (R): IE₁(N) > IE₁(O) because nitrogen has a stable half-filled 2p³ configuration.
- ABoth Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A)
- BBoth Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A)
- CAssertion (A) is true, but Reason (R) is false
- DAssertion (A) is false, but Reason (R) is true
✓ Correct answer: A
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