9-1 Chemistry/Identification of common gases
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An example of litmus paper which is used to test for chlorine gas. 
Test for hydrogen[edit | edit source]
Use a burning splint held at the open end of a test tube of gas. Hydrogen burns rapidly with a squeaky pop sound.
Test for oxygen[edit | edit source]
The test for oxygen uses a glowing splint inserted into a test tube of the gas. The splint relights in oxygen.
Test for carbon dioxide[edit | edit source]
An aqueous solution of calcium hydroxide, known as lime water. When carbon dioxide is shaken with or bubbled through limewater, the limewater turns cloudy.
Test for chlorine[edit | edit source]
When damp litmus paper is put into chlorine gas, the litmus paper is bleached and turns white.