The chemical property of hydrogen gas is that it burns in the air.
• The lightest element is hydrogen, it can explode at concentrations ranging from 4 to 75 percent by volume in the existence of a flame, sunlight, or a spark.
• One of the prime chemical properties of hydrogen gas is that it is highly flammable and can burn in air at a very broad array of concentrations that is between 4 to 75 percent by volume.
• Some of the physical properties of hydrogen gas are that it is colorless, odorless, nonmetallic, non-toxic, exhibits a density of 0.09 grams per liter, and has a boiling point of -252.87 degree C or 20 K at standard pressure.
Thus, of the mentioned statements, option 2 is correct, that is, the chemical property of hydrogen gas is that it burns in the air.
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