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Carbon dioxide and Ammonia.



Carbon dioxide
Ammonia
  1. Carbon dioxide is odourless.
  2. it is collected by upward displacement of air.
  3. It turns moistened blue litmus red.
  4. It is fairly soluble in water
  1. Ammonia has sharp, pungent and irritating odour.
  2. It is collected by the downward displacement of air.
  3. It turns moistened red litmus blue.
  4. It is highly soluble in water.