Hydrogen peroxide solution decomposes to produce water and oxygen. A student collects the gas given off. Which pair of results confirms that the gas is oxygen and not hydrogen?
a burning splint pops, and limewater stays clear
a glowing splint goes out, and limewater turns milky
a burning splint pops, and damp litmus turns white
a glowing splint relights, and no pop is heard
40 exam-style questions on AQA GCSE Chemistry 8.2 Identification of common gases, covering 8.2.1 Test for hydrogen, 8.2.2 Test for oxygen, 8.2.3 Test for carbon dioxide, and 8.2.4 Test for chlorine. Each one has a worked solution and a mark scheme showing where the marks go.