alleryThe ionisation enthalpy of group 15 exceeds that of group:
ASixteen
BEighteen
CSeventeen
DFourteen
Answer & Solution
Correct answer: D. Fourteen
1. Group 15 has a half filled p subshell and a smaller size.
2. That makes removing an electron harder than for its neighbour.
3. So its ionisation enthalpy is greater than that of group 14.
_Source: syllabus Chemistry, Chapter 7, The p-Block Elements._
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