An excess of dilute nitric acid is added to a test tube containing solid sodium carbonate. A gaseous product is evolved and collected. Which test and observation would confirm the identity of this gas?
It relights a glowing wooden splint, confirming the gas is oxygen.
It burns with a squeaky pop when exposed to a lighted splint, confirming the gas is hydrogen.
It produces a white precipitate when bubbled through limewater, confirming the gas is carbon dioxide.
It turns damp red litmus paper blue, confirming the gas is ammonia.
276 exam-style questions on Edexcel GCSE Chemistry 4.1 Acids, covering 4.1.1 Acids, alkalis and the pH scale, 4.1.2 Hydrogen ion concentration and pH, 4.1.3 Dilute and concentrated, weak and strong acids, 4.1.4 Bases, alkalis and the reactions of acids, 4.1.5 Chemical tests for hydrogen and carbon dioxide, 4.1.6 Neutralisation as a reaction of acids with bases, 4.1.7 Preparing soluble salts, and 4.1.8 Solubility rules and preparing insoluble salts. Each one has a worked solution and a mark scheme showing where the marks go.