A) Electron affinity- \[-N<O<F<Cl\]
B) 1st ionisation potential \[-Be<B<N<O\]
C) Basic property \[-MgO<CaO<FeO<F{{e}_{2}}{{O}_{3}}\]
D) Reactivity \[-Be<Li<K<Cs\]
Correct Answer: B
Solution :
Correct order is \[B<Be<O<N.\]
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