SELECT THE ODD ONE OUT GIVING REASONS :
1. Helium, Neon, Argon, Nitrogen, Xenon.
2. Oxygen, Nitrogen, Carbon dioxide, Water vapours, Hydrogen.
3. CO, NO, SO2, CO2, Oz.
4. Vehicles, Industries, Chimneys, Forest fires, Scrubbers.
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Answer:
Water is a liquid
Oz is meaningless
Scrubber do not release dust
Explanation:
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