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 \[{{O}^{+}}\] is cation, .it means it is already electron deficient. Among \[N,\,\,O,\,\,{{O}^{+}}\] and \[Na\] it will be most difficult to take out electron from\[{{O}^{+}}\]. \[\therefore \,\,{{O}^{+}}\]has highest ionisation energy among given choices.
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