Question

Choose the most appropriate answer from the following list of oxides which fits the description. Each answer may be used only once:

[SO₂, SiO₂, Al₂O₃, MgO, CO, Na₂O]

1. A basic oxide.
2. An oxide which dissolves in water forming an acid.
3. An amphoteric oxide.
4. A covalent oxide of a metalloid.

Answer 1

1. MgO or Na₂O
2. SO₂
3. Al₂O₃
4. SiO₂