A Level Chemistry 9701/12/O/N/20 Q19


Compound X is the oxide of a Period 3 element. Compound X reacts with water to give an acidic solution.
A solution is prepared by reacting 0.100 g of compound X with an excess of water. This solution is neutralised by exactly 25.0 cm3 of 0.100 mol dm–3 sodium hydroxide solution.

What could be the identity of compound X?

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