Aluminium reacts with iron(III) oxide as shown.
iron(III) oxide + aluminium → iron + aluminium oxide

Which statement about this reaction is correct?

• A Aluminium is oxidised.

• D Iron is oxidised.

• B Aluminium oxide is reduced.

• C Iron(III) oxide is oxidised.

The equations below all show redox reactions.

Fe2O3 + 3CO → 2Fe + 3CO2
2ZnO + C → 2Zn + CO2
Fe2O3 + 2Al → Al 2O3 + 2Fe
2CO + 2NO → 2CO2 + N2

Which oxide is oxidised in these reactions?

• D NO

• A Fe2O3

• C ZnO

• B CO

The element vanadium, V, forms several oxides.
In which change is oxidation taking place?

• D V2O3 → V2O5

• A VO2 → V2O3

• B V2O5 → VO2

• C V2O3 → VO

The reaction between magnesium and carbon dioxide is represented by the following equation.
2Mg + CO2 → 2MgO + C

Which statement describes what happens in this reaction?

• A Carbon is oxidised.

• B Magnesium is reduced.

• C Neither oxidation nor reduction happens.

• D The carbon in carbon dioxide is reduced.

In which equation does the oxidation of the underlined compound occur?

When copper is heated in air a black coating forms on the copper.
What happens to the copper in this reaction?

• C The copper gains oxygen.

• B The copper decomposes.

• A The copper catches fire.

• D The copper loses oxygen.

Iron is extracted from iron oxide using carbon monoxide as shown in the equation.
iron oxide + carbon monoxide → iron + carbon dioxide

What does the equation show?

• A Carbon monoxide is oxidised to carbon dioxide.

• B Carbon monoxide is reduced to carbon dioxide.

• C Iron is oxidised to iron oxide.

• D Iron oxide is oxidised to iron.