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The first ionisation enthalpy of oxygen against nitrogen is:
AEqual
BDoubled
CSmaller
DLarger
Answer & Solution
Correct answer: C. Smaller
1. Oxygen follows nitrogen in the same period.
2. Its value nonetheless breaks the rising trend.
3. It is smaller than that of nitrogen.
_Source: NCERT Class 11 Chemistry Part I, Chapter 3, Classification of Elements and Periodicity in Properties._
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