Which of the following results indicates exothermic change

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Which of the following results indicates exothermic change in atoms?

1. The production of line emission spectra
2. The appearance of dark lines in absorption spectra
3. The formation of ions from a metal in the gaseous state
4. The production of isotopic species of CO+ and CO₂ + when CO₂ is placed in a mass spectrograph

Correct Option: A

NA