Chemistry · Periodicity of Elements and Periodic Properties
JEE Main 2024 — 4 April, Shift 2 — Question 71
Given below are two statements, one is labelled as Statement I and the other is labelled as Statement II.
Statement I : The correct order of first ionization enthalpy values of and Cl is .
Statement II : The correct order of negative electron gain enthalpy values of and Cl is
In the light of the above statements, choose the correct answer from the options given below :
- Option A:Correct
Both Statement I and Statement II are true
- Option B:
Both Statement I and Statement II are false
- Option C:
Statement I is false but Statement II is true
- Option D:
Statement I is true but Statement II is false
Answer: A
Step-by-step solution
Statement I is True: First ionization enthalpy decreases down a group and increases across a period. Therefore, the correct order of first ionization enthalpy is .
Statement II is True: Electron gain enthalpy becomes more negative across a period and less negative down a group. Due to the small size of fluorine, chlorine has a more negative electron gain enthalpy than fluorine. Hence, the correct order of negative electron gain enthalpy is .
Thus, both Statement I and Statement II are true (Option A).
Answer key and solution verified before publishing.
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- Exam
- JEE Main 2024
- Paper
- 4 April, Shift 2
- Subject
- Chemistry
- Chapter
- Periodicity of Elements and Periodic Properties
- Topic
- Periodicity in Chemical Properties (Ionization Energy, Electron Affinity, Electronegativity)