Which name-formula pair is correct?
magnesium chloride, MgCl\mathrm{MgCl}MgCl
sodium sulfide, Na2SO4\mathrm{Na_{2}SO_{4}}Na2SO4
sodium sulfate, Na2SO4\mathrm{Na_{2}SO_{4}}Na2SO4
calcium nitrate, CaNO2\mathrm{CaNO_{2}}CaNO2
56 exam-style questions on Edexcel GCSE Chemistry 2.3 Ionic bonding, covering 2.3.1 Ions and the formation of ionic bonds, 2.3.2 Naming and deducing formulae of ionic compounds, and 2.3.3 Giant ionic lattices. Each one has a worked solution and a mark scheme showing where the marks go.