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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.
A sour gas contains high amounts of hydrogen sulfide, while an actual acid gas contains any of the acidic gases. When found in natural gas, hydrogen sulfide can be considered both a sour gas and an acid gas. Carbon dioxide, however, is an acidic gas but not technically a sour gas.