A student adds an excess of dilute hydrochloric acid to a green solid, XXX. A rapid effervescence is observed, producing a gas, YYY, and leaving a blue-green solution. When gas Y Y\,Y is bubbled through a colorless solution, ZZZ, a white precipitate is formed.
Which of the following correctly identifies XXX, YYY, and ZZZ?
X=FeCO3(s)X = \text{FeCO}_3\text{(s)}X=FeCO3(s), Y=CO2(g)Y = \text{CO}_2\text{(g)}Y=CO2(g), Z=BaCl2(aq)Z = \text{BaCl}_2\text{(aq)}Z=BaCl2(aq)
X=CuCl2(s)X = \text{CuCl}_2\text{(s)}X=CuCl2(s), Y=Cl2(g)Y = \text{Cl}_2\text{(g)}Y=Cl2(g), Z=KI(aq)Z = \text{KI(aq)}Z=KI(aq)
X=CuCO3(s)X = \text{CuCO}_3\text{(s)}X=CuCO3(s), Y=CO2(g)Y = \text{CO}_2\text{(g)}Y=CO2(g), Z=Ca(OH)2(aq)Z = \text{Ca(OH)}_2\text{(aq)}Z=Ca(OH)2(aq)
X=NiCO3(s)X = \text{NiCO}_3\text{(s)}X=NiCO3(s), Y=CO2(g)Y = \text{CO}_2\text{(g)}Y=CO2(g), Z=NaOH(aq)Z = \text{NaOH(aq)}Z=NaOH(aq)
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.