Redox, rusting and iron test questions - CCEA Double Award - GCSE Combined Science Revision

1

Which of the following lists of raw materials are put into the top of the blast furnace?

Haematite, coke and limestone

Iron, coke, limestone

Bauxite, coke and limestone

2

Which of the following statements about sacrificial protection is true?

A less reactive metal is coated over a more reactive metal.

Copper can be used to protect iron.

Zinc is used to protect iron.

3

What is the chemical name for rust?

Iron(III) oxide

Hydrated iron(III) oxide

Hydrated iron(II) oxide

4

Which of the following reactions involves redox?

NaOH + HCl -> NaCl + H₂O

CaCO₃ + H₂SO₄ -> CaSO₄ + CO₂ +H₂O

CuSO₄ +Mg -> MgSO₄ + Cu

5

Which of the following statements is true?

Oxidation is the gain of electrons

Oxidation is the loss of hydrogen

Oxidation is the loss of oxygen

6

Which of the following half equations is correct?

Fe²⁺ → Fe + 2e^-

Mg + 2e^- → Mg²⁺

Cu²⁺ + 2e^- → Cu

7

What is the chemical name for slag?

Calcium carbonate

Calcium silicate

Calcium sulphate

8

In the blast furnace, the reducing agent is:

Carbon monoxide

Carbon

Carbon dioxide

9

Which two substances are essential for rusting to occur?

Salt and water

Water and oxygen (air)

Salt and oxygen (air)

10

Which of the following statements is true about the reaction of copper(II) sulfate with magnesium? CuSO₄ + Mg -> MgSO₄ + Cu

Magnesium atoms are reduced

Copper ions are oxidised

Magnesium atoms are oxidised