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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.
Carbon dioxide is acidic in nature. CO2 + H2O > H2CO3. Infact all the co partner gases like So4, So3, NO3 are acidic. Acidic nature of CO2 is most commonly seen in 1  :-. Acid rains which destroy important monuments.  Rusting of Iron has a very important step where CO2 converts to H2CO3 promoting the corrosion activity.