Which balanced equation shows the reaction of magnesium oxide with hydrochloric acid?
MgO+2HCl→Mg+Cl2+H2O\mathrm{MgO + 2HCl \rightarrow Mg + Cl_2 + H_2O}MgO+2HCl→Mg+Cl2+H2O
MgO+HCl→MgCl+H2O\mathrm{MgO + HCl \rightarrow MgCl + H_2O}MgO+HCl→MgCl+H2O
MgO+2HCl→MgCl2+H2O\mathrm{MgO + 2HCl \rightarrow MgCl_2 + H_2O}MgO+2HCl→MgCl2+H2O
MgO+2HCl→MgCl2+H2\mathrm{MgO + 2HCl \rightarrow MgCl_2 + H_2}MgO+2HCl→MgCl2+H2
44 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.