Two oxides of Period 3 elements are each placed in water separately. In both cases, colourless solutions are formed. One of the solutions is alkaline, whereas the other is acidic. Which two oxides could they be?
- A$\text{Al}_2\text{O}_3$ and $\text{SiO}_2$
- B$\text{Al}_2\text{O}_3$ and $\text{P}_4\text{O}_{10}$
- C$\text{Na}_2\text{O}$ and $\text{P}_4\text{O}_{10}$
- D$\text{Na}_2\text{O}$ and $\text{SiO}_2$