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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.
This precipitation could include snow, fog or bits of dry material in the atmosphere which drift down to Earth. Acid rain is formed when chemicals such as sulfur dioxide (SO2) or nitrogen oxides (NOx) react with water in the atmosphere to form mild solutions of sulfuric or nitric acid. The acidity of solutions is measured on a logarithmic pH scale from 0 to 14 with 0 being most acidic and 14 being most alkaline and 7 as neutral.