A white solid, Y, gives no colour in a flame test. When Y is warmed with sodium hydroxide solution, a gas forms that turns damp red litmus paper blue. A solution of Y is acidified with dilute nitric acid and silver nitrate solution is added. A cream precipitate forms.
What is Y?
ammonium chloride
potassium bromide
ammonium iodide
ammonium bromide
35 exam-style questions on Edexcel GCSE Chemistry 10.1 Qualitative analysis: tests for ions, covering 10.1.1 Principles of ion tests and flame tests, 10.1.2 Tests for cations and for ammonia, 10.1.3 Tests for anions, 10.1.4 Identification of ions in unknown salts, and 10.1.5 Instrumental methods of analysis. Each one has a worked solution and a mark scheme showing where the marks go.