The ionisation potential of nitrogen is-

Correct option is D

The answer is (d) Greater than that of oxygen.
Here's the explanation:
· Ionization potential refers to the minimum energy required to remove the outermost electron from an atom in its gaseous state.
· Nitrogen (N) has a half-filled p-orbital configuration, which is relatively stable. Removing an electron from this stable configuration requires more energy.
· Oxygen (O), on the other hand, has one more electron than nitrogen and doesn't have a completely filled or half-filled subshell in its valence state.
Therefore, it's easier to remove an electron from oxygen compared to nitrogen. Consequently, the ionization potential of nitrogen is greater than that of oxygen.