2.39 Describe tests for the gases

Hydrogen
A lighted wooden splint goes pop when put into a test tube, for example, of hydrogen

Oxygen
A glowing splint will relight if placed into a test tube of oxygen

Carbon Dioxide
When bubbled into lime water (calcium hydroxide solution) the lime water will become cloudy white. A lighted wooden splint will go pop but as this happens in other gases it is an unsuitable test

Ammonia
It makes damp, red litmus paper turn blue. It has a characteristic choking, pungent smell and will put out a lit splint

Chlorine
It will turn damp blue litmus paper red; and moist indicator paper red. It then bleaches both papers till they are white. Like ammonia it has a sharp, choking odour and will also put out a lit splint