Four mixtures are added to four separate 50 cm$^3$ samples of water and stirred.
Which mixture results in a solution with the highest pH?
1 )
1.0 g of aluminium oxide and 1.0 g of aluminium chloride
1.0 g of magnesium oxide and 1.0 g of magnesium chloride
3 )
1.0 g of phosphorus oxide and 1.0 g of phosphorus chloride
4 )
1.0 g of silicon dioxide and 1.0 g of silicon chloride
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