Which of the following results indicates exothermic change

Severity: Warning

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Backtrace:

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Severity: Warning

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Backtrace:

File: /var/www/interviewmania.com/index.php
Line: 315
Function: require_once

Which of the following results indicates exothermic change

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

NA