Given below are two statements:
Statement I: Fluorine has most negative electron gain enthalpy in its group.
Statement II: Oxygen has least negative electron gain enthalpy in its group.
In the light of the above statements, choose the most appropriate from the options given below.
Statement I: Fluorine has most negative electron gain enthalpy in its group.
Statement II: Oxygen has least negative electron gain enthalpy in its group.
In the light of the above statements, choose the most appropriate from the options given below.
- (A)Both Statement I and Statement II are true
- (B)Statement I is true but Statement II is false
- (C)Both Statement I and Statement II are false
- (D)Statement I is false but Statement II is true✓ Correct
Answer: (D)
Solution
Statement I is false: within Group 17, chlorine — not fluorine — has the most negative electron gain enthalpy. Fluorine's very small atomic size means an incoming electron enters an already compact and electron-dense 2p subshell, and the resulting inter-electronic repulsion partly offsets the energy released, making fluorine's electron gain enthalpy less negative than chlorine's.
Statement II is true: within Group 16, oxygen has the least negative electron gain enthalpy. The same small-size, high-electron-density effect applies — sulfur, selenium and tellurium, being larger, accommodate the extra electron with less repulsion and release more energy.
Statement I is false but Statement II is true.
Statement II is true: within Group 16, oxygen has the least negative electron gain enthalpy. The same small-size, high-electron-density effect applies — sulfur, selenium and tellurium, being larger, accommodate the extra electron with less repulsion and release more energy.
Statement I is false but Statement II is true.
JEE Main · 2024 · 29 Jan 2024 · Shift 2 · Single correct option