Chemistry 0620 · IGCSE · Formulae

Formulae — practice question

Aluminium oxide is an ionic compound made up of $\text{Al}^{3+}$ ions and $\text{O}^{2-}$ ions. Aluminium hydroxide is an ionic compound made up of $\text{Al}^{3+}$ ions and $\text{OH}^-$ ions. Which row shows the correct formulae for aluminium oxide and aluminium hydroxide?

  • A$\text{Al}_2\text{O}_3$ and $\text{Al(OH)}_3$
  • B$\text{Al}_3\text{O}_2$ and $\text{AlOH}_3$
  • C$\text{Al}_2\text{O}_3$ and $\text{AlOH}_3$
  • D$\text{Al}_3\text{O}_2$ and $\text{Al(OH)}_3$

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