OnlineCBT
Chemistry · Classification of Elements and Periodicity in Properties
हिन्दीGiven below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The first ionization enthalpy of molecular nitrogen is greater than that of oxygen. Reason (R): Nitrogen has a stable half-filled \( 2p^3 \) electronic configuration which requires higher energy to remove an electron compared to oxygen's \( 2p^4 \) configuration. In the light of the above statements, choose the correct answer from the options given below:
Correct answer · Option 1
Both (A) and (R) are true and (R) is the correct explanation of (A).
Explanation
Nitrogen (\( 1s^2 2s^2 2p^3 \)) has extra stability due to its half-filled p-orbitals, leading to a higher ionization enthalpy than oxygen (\( 1s^2 2s^2 2p^4 \)). Thus both Assertion and Reason are true and R correctly explains A.
