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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.
Noble gases Helium, neon, argon, krypton, xenon AND radon The Noble Gases typically have very low melting and boiling points, have a low density, are gas at room temperature, and are typically odorless, colorless, insipid and non-toxic (except for radon). They are either denser or lighter than air. Helium- Lighter than air 0.1786 grams density Melting point -272.0 Â°C Boiling point - 268.6 Â°C