Chemistry · Oct / Nov 2022 · Paper 12 · Question 9
An ionic compound has the formula $\mathrm{Al_2O_3}$. What are the charges on the ions?
- A$\mathrm{Al^+}$ $\mathrm{O^-}$
- B$\mathrm{Al^{2+}}$ $\mathrm{O^{2-}}$
- C$\mathrm{Al^{2+}}$ $\mathrm{O^{3-}}$
- D$\mathrm{Al^{3+}}$ $\mathrm{O^{2-}}$
As printed in the paper
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Correct answer: D. $\mathrm{Al^{3+}}$ $\mathrm{O^{2-}}$
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