Question:
Which of the following statements are NOT correct?
I. Addition of electron to a gaseous atom is always exothermic.
II. Removal of electron from gaseous atom is always endothermic.
III. First ionization enthalpy of oxygen is greater than nitrogen.
IV. In group I elements lithium is least electropositive.
Which of the following statements are NOT correct?
I. Addition of electron to a gaseous atom is always exothermic.
II. Removal of electron from gaseous atom is always endothermic.
III. First ionization enthalpy of oxygen is greater than nitrogen.
IV. In group I elements lithium is least electropositive.
I. Addition of electron to a gaseous atom is always exothermic.
II. Removal of electron from gaseous atom is always endothermic.
III. First ionization enthalpy of oxygen is greater than nitrogen.
IV. In group I elements lithium is least electropositive.
Show Hint
Half-filled and fully-filled subshells show extra stability.
Updated On: Jun 17, 2026
- I, III, IV only
- I & II only
- I & III only
- II & IV only
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Electron gain enthalpy is NOT always exothermic (exceptions like noble gases, Be, N due to stability). Hence Statement I is incorrect.
Step 2: Ionization always requires energy, so Statement II is correct.
Step 3: Due to half-filled stability of nitrogen (2p$^3$), IE(N) > IE(O), so Statement III is incorrect.
Step 4: Lithium is most electropositive among group I due to small size and high ionization energy, so Statement IV is incorrect.
Step 5: Hence incorrect statements are I, III, IV.
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