A technician identifies the positive and negative ions in four unlabelled compounds.
| Compound | Positive ion | Negative ion |
|---|---|---|
| P | Na+\mathrm{Na^{+}}Na+ | Cl−\mathrm{Cl^{-}}Cl− |
| Q | Mg2+\mathrm{Mg^{2+}}Mg2+ | NO3−\mathrm{NO_{3}^{-}}NO3− |
| R | K+\mathrm{K^{+}}K+ | O2−\mathrm{O^{2-}}O2− |
| S | Ca2+\mathrm{Ca^{2+}}Ca2+ | OH−\mathrm{OH^{-}}OH− |
Which row has a negative ion with a name ending in -ate?
Give the formula of the compound in this row.
119 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.