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Question

The process requiring the absorption of energy is:


A
FF
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B
ClCl
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C
OO2
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D
HH
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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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