Reaction 1: Magnesium reacts with dilute hydrochloric acid.
Reaction 2: Calcium carbonate is heated strongly.
Reaction 3: Sodium carbonate reacts with dilute sulfuric acid.
Reaction 4: Concentrated sodium chloride solution is electrolysed.
In which reactions is a gas made that turns limewater milky?
2 and 3 only
3 only
1, 2 and 3 only
2, 3 and 4 only
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.