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a
O2- is stabilised due to inert gas configuration.
b
Formation of O- is endothermic
c
Formation of Flouride ion is exothermic
d
Electron affinity of Be is almost Zero
answer is B.
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Detailed Solution
Addition of electron in the outermost phase is always exothermic, Hence the formation of O- is exothermic, but if further electron is added then the existinf electron will create repulsion and the second step is endothermic.