IGCSE Chemistry Paper 1 · Multiple Choice practice papers

A student tests a colourless liquid to find out whether it is pure water.
1    Pure water boils at exactly 100 °C at atmospheric pressure.
2    If it contains water, it turns white anhydrous copper(II) sulfate blue.
3    If the liquid contains water, it turns anhydrous copper(II) sulfate white.
Which statements are correct?

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

What is the formula of magnesium phosphate?

1. A Mg₂(PO₄)₃
2. B MgPO₄
3. C Mg₃PO₈
4. D Mg₃(PO₄)₂

The energy level diagram is for a reaction. Which statement is correct?

1. A The reaction is exothermic.
2. B The activation energy is negative.
3. C The reaction is endothermic.
4. D The products have the same energy as the reactants.

Why does sodium chloride have a high melting point?

1. A strong electrostatic attraction between oppositely charged ions
2. B delocalised electrons
3. C weak intermolecular forces
4. D covalent bonds between molecules

Why does the smell of perfume spread across a room?

1. A Perfume particles are heavier than air.
2. B Air particles are attracted to perfume particles.
3. C The perfume reacts with air.
4. D Perfume particles move randomly and mix with air particles.

How does a catalyst increase the rate of a reaction?

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