Which of the following processes involves absorption of energy?

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Questions Match

1.
Which of the following processes involves absorption of energy?

1. O–(g) + e–  O2–(g)2. O(g) + e–  O–(g)3. Cl(g) + e–  Cl–(g)4. S(g) + e–  S–(g)

Which of the following processes involves absorption of energy?