- Hydrogen sulphide has an offensive odour like that of rotten
eggs.
- It is acidic in nature.
- It is collected by upward displacement of air.
- It turns moist blue litmus paper red.
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- Ammonia has a sharp, pungent and irritating odour.
- It is basic in nature.
- It is collected by the downward displacement of air.
- It turns moist red litmus paper blue.
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