A) \[P\]
B) \[N\]
C) \[As\]
D) \[Sb\]
Correct Answer: B
Solution :
The electronic configuration of atoms of group 15 are half filled, ie,\[(np_{x}^{1},\,\,np_{y}^{1},\,\,np_{z}^{1})\] and are stable therefore, they have high ionization enthalpy. Ongoing down the group, the ionization enthalpy decreases due to increase in atomic size. Hence, \[N\] has highest ionization enthalpy.
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