A test tube contains a mixture of hydrogen and carbon dioxide.
A student bubbles the mixture through excess limewater. The student collects the gas that comes out and holds a lit splint at the mouth of the tube.
Which observations are correct?
The limewater turns milky, and the lit splint goes out.
The limewater stays colourless, and the lit splint gives a squeaky pop.
The limewater turns milky, and the lit splint gives a squeaky pop.
The limewater stays colourless, and the lit splint goes out.
52 exam-style questions on OCR GCSE Chemistry 4.2 Identifying the products of chemical reactions, covering 4.2.1 Tests to identify gases, 4.2.2 Tests for aqueous ions and flame tests, and 4.2.3 Instrumental methods of analysis. Each one has a worked solution and a mark scheme showing where the marks go.