An equimolar solid mixture containing two Period 3 oxides is added to an excess of water. After stirring, a strongly alkaline solution (pH≈13\text{pH} \approx 13pH≈13) and a white insoluble residue are obtained. The mixture is filtered.
The white residue is collected and tested. It does not react when treated with dilute nitric acid, but dissolves completely when heated with a concentrated solution of sodium hydroxide.
Which pair of oxides was present in the original mixture?
Na2O\text{Na}_2\text{O}Na2O and SiO2\text{SiO}_2SiO2
P4O10\text{P}_4\text{O}_{10}P4O10 and Al2O3\text{Al}_2\text{O}_3Al2O3
Na2O\text{Na}_2\text{O}Na2O and Al2O3\text{Al}_2\text{O}_3Al2O3
MgO\text{MgO}MgO and SiO2\text{SiO}_2SiO2
17 exam-style questions on AQA A Level Chemistry Properties of Period 3 elements and their oxides (A-level only), covering Properties of Period 3 elements and their oxides (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.