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What is the test for hydrogen?
Uses a burning splint held at the open end of a test tube of the gas.
Hydrogen burns rapidly with a pop sound.
What is the test for oxygen?
Uses a glowing splint inserted into a test tube of the gas.
The splint relights in oxygen.
What is the test for carbon dioxide?
Uses an aqueous solution of calcium hydroxide (lime water).
When carbon dioxide is shaken with or bubbled through limewater the limewater turns milky (cloudy).
What is the test for chlorine?
uses litmus paper. When damp litmus paper is put into chlorine gas the litmus paper is bleached and turns white.
Note 
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