Question

The process requiring the absorption of energy is:

A
FF
B
ClCl
C
OO2
D
HH

Solution

The correct option is D $$O^{-}\rightarrow O^{2-}$$Second electron affinity is zero for an element since already added electron repels existing electrons. Hence, it becomes difficult for an atom to take up another electron. Therefore, the process $$O^{-}$$$$\rightarrow$$$$O^{2-}$$ requires energy.Chemistry

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