IGCSE Chemistry Paper 2 · Multiple Choice practice papers

The temperature of a reacting mixture of two solutions is increased.
1    The rate increases only because the particles collide more frequently.
2    The particles move faster, so they collide more frequently.
3    The concentration of the reactants increases.
Which statements are correct?

1. A 1 and 2 only
2. B 1 and 3 only
3. C 2 and 3 only
4. D 2 only

A substance is heated steadily from solid to gas. Its temperature is measured every minute.
1    The particles move faster while the substance is boiling.
2    A pure substance melts over a range of temperatures.
3    The temperature stays constant while the substance melts.
Which statements are correct?

1. A 1 and 2 only
2. B 1 and 3 only
3. C 2 and 3 only
4. D 3 only

What is the only product of a hydrogen–oxygen fuel cell?

1. A carbon dioxide
2. B water
3. C oxygen
4. D hydrogen peroxide

25.0 cm³ of aqueous sodium hydroxide is neutralised by 20.8 cm³ of 0.100 mol/dm³ hydrochloric acid. What is the concentration of the sodium hydroxide?

1. A 0.0000832 mol/dm³
2. B 0.0832 mol/dm³
3. C 0.12 mol/dm³
4. D 2.08 mol/dm³

What is the relative formula mass, M_r, of CaCO₃? (A_r: Ca = 40, C = 12, O = 16)

1. A 68
2. B 100
3. C 116
4. D 120

How does a catalyst increase the rate of a reaction?

1. A It provides a pathway with a lower activation energy.
2. B It increases the energy of the particles.
3. C It is used up in the reaction.
4. D It increases the concentration.