Which of the following process involves the gain of energy ?

Chemistry · JEE Main · NTA Exams — Classification of Elements and Periodicity in Properties

Which of the following process involves the gain of energy ?
  1. O(g) + e– \(\text { → }\)O–(g)
  2. Na+ + e– \(\text { → }\) Na
  3. O–(g) + e–\(\text { → }\)O2–(g)
  4. O2–(g) \(\text { → }\)O–(g) + e–

Answer

(C) O – (g) + e – → O 2– (g)

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