A) N
B) O
C) \[{{O}^{+}}\]
D) Na
Correct Answer: C
Solution :
Key Idea: The ionisation potential is amount of energy required to take out most loosely bonded electron \[{{\text{O}}^{\text{+}}}\]is cation, it means it is already electron deficient. Among \[\text{N,}\,\text{O, }{{\text{O}}^{\text{+}}}\]and Na it will be most difficult to take out electron from \[{{\text{O}}^{\text{+}}}\] \[\therefore \]\[{{\text{O}}^{\text{+}}}\]has highest ionisation energy among given choices.
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