Four mixtures are each introduced into four separate $50\text{ cm}^3$ water samples and then stirred. Which mixture gives a solution with the greatest pH?
- A$1.0\text{ g}$ of aluminium oxide and $1.0\text{ g}$ of aluminium chloride
- B$1.0\text{ g}$ of magnesium oxide and $1.0\text{ g}$ of magnesium chloride
- C$1.0\text{ g}$ of phosphorus oxide and $1.0\text{ g}$ of phosphorus chloride
- D$1.0\text{ g}$ of silicon dioxide and $1.0\text{ g}$ of silicon chloride