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Report Abuse. Acidic Gases are those gases, which when dissolved in water, show acidic properties. CO2 when dissolved gives H2CO3, which is acidic, NO2 gives HNO3(Nitric Acid). SO2 gives Sulphurous Acid, SO3 gives Sulphuric Acid. There are plenty of such examples.
Sewer gas is a complex mixture of toxic and non-. toxic gases which collect in the sewage system at. varying levels depending on the source. Sewer gas. is formed during the decay of household and. industrial waste. Highly toxic components of sewer. gas include hydrogen sulfide and ammonia.