CH-1301
Air pollutants
Chemistry · Secondary 4 · Medium · Air pollutants
Hydrogen sulfide in biogas has a pungent smell. Which statement best explains why farmers can easily detect an increase in its level?
- It has a strong, pungent odour that is easily noticed
- It is colourless and cannot be seen
- It is denser than air and sinks to the ground
- It is non-toxic at all concentrations
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