Given below are two statements on ionization enthalpy and electron gain enthalpy
Q. Given below are two statements :

Statement I : C < O < N < F is the correct order in terms of first ionization enthalpy values.

Statement II : S > Se > Te > Po > O is the correct order in terms of the magnitude of electron gain enthalpy values.

In the light of the above statements, choose the correct answer from the options given below :
A. Both Statement I and Statement II are false
B. Statement I is false but Statement II is true
C. Statement I is true but Statement II is false
D. Both Statement I and Statement II are true
Correct Answer: Both Statement I and Statement II are true

Explanation

First ionization enthalpy generally increases across a period. However, due to half-filled stability of nitrogen, oxygen has lower ionization enthalpy than nitrogen. Hence, the correct increasing order is C < O < N < F, making Statement I true.

Electron gain enthalpy depends on atomic size and inter-electronic repulsion. In group 16, oxygen has lower magnitude of electron gain enthalpy due to its small size and high repulsion, while sulphur has the highest magnitude. Thus the correct order is S > Se > Te > Po > O, making Statement II true.

Therefore, both Statement I and Statement II are correct.

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