Question

Choose the most appropriate answer from the following list of oxides which fit the description. Each answer may he 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

2. SO₂ 

3. Al₂O₃ 

4. CO