JEE Main Chemistry question

Statement 1: Ionisation energy of nitrogen (atomic number 7) is more than that of oxygen (atomic number 8). Statement 2: Half-filled -orbitals in nitrogen () are more stable.

(A)Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1Correct
(B)Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
(C)Statement 1 is True, Statement 2 is False
(D)Statement 1 is False, Statement 2 is True

Answer: (A)

Solution

The first ionisation energy of nitrogen (≈1402 kJ/mol) is indeed higher than that of oxygen (≈1314 kJ/mol), even though oxygen comes after nitrogen in the period; this is Statement 1, which is true. This anomaly occurs precisely because nitrogen's symmetrical, half-filled configuration is extra stable, making

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Question ID VK-133316