IGCSE Chemistry 0620 Paper 12, May/June 2026

Two gas jars are arranged as shown. The glass plate is removed and the jars allowed to stand for 3 hours. Which statement explains the change in the gas jars after 3 hours? A Bromine has a greater density than air. B Bromine particles move from an area of high concentration to an area of low concentration. C Bromine particles move faster than the particles in air. D The particles in air are heavier than those in bromine.

What is the relative charge and the relative mass of an electron?

Which row identifies the particles present in the nucleus and in the shells of one atom of ${}_3^7\mathrm{L}\mathrm{i}$?

Element M is in Group I and element N is in Group VII. Which diagram represents the bond that forms when element M and element N react together?

What is the total number of shared electrons in one molecule of ammonia? A 2 B 4 C 6 D 8

Which use of graphite depends on the layers of carbon atoms being able to slide over each other? A cutting tools B electrodes C jewellery D lubricant

The diagram represents phosphoric acid. What is the molecular formula for phosphoric acid? A ${\mathrm{H}}_2{\mathrm{P}\mathrm{O}}_4$ B ${\mathrm{H}\mathrm{P}\mathrm{O}}_4$ C ${\mathrm{H}}_3{\mathrm{P}\mathrm{O}}_4$ D ${\mathrm{P}(\mathrm{O}\mathrm{H})}_4$

The equation for the complete combustion of methane, ${\mathrm{C}\mathrm{H}}_4$, is shown. $${\mathrm{C}\mathrm{H}}_4+2{\mathrm{O}}_2\to {\mathrm{C}\mathrm{O}}_2+2{\mathrm{H}}_2\mathrm{O}$$ $160\mathrm{g}$ of methane is completely combusted in oxygen to form carbon dioxide and water only. [$M_r$: ${\mathrm{C}\mathrm{H}}_4$, 16; ${\mathrm{O}}_2$, 32; ${\mathrm{H}}_2\mathrm{O}$, 18] Which row gives the mass of oxygen needed for complete combustion and the mass of water formed?

Four units are listed. 1 ${\mathrm{d}\mathrm{m}}^3\mathrm{/}\mathrm{m}\mathrm{o}\mathrm{l}$ 2 $\mathrm{g}\mathrm{/}{\mathrm{d}\mathrm{m}}^3$ 3 $\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{/}{\mathrm{d}\mathrm{m}}^3$ 4 $\mathrm{g}\mathrm{/}\mathrm{m}\mathrm{o}\mathrm{l}$ Which units are units of concentration? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Which row identifies the cathode, the anode and the electrolyte when nickel is electroplated with a thin layer of silver?

X is an insoluble binary compound. In an experiment, X is electrolysed to form two elements. Which statement describes X? A X is a molten ionic compound. B X is an aqueous ionic compound. C X is a molten covalent compound. D X is a solid covalent compound.

Which statement about a fuel cell in a car is correct? A The fuel cell produces heat, which powers the car. B The fuel cell is supplied with hydrogen directly from the air. C The only emission from a fuel cell is nitrogen gas, which is non-polluting. D The fuel cell produces electricity, which powers an electric motor.

Which statement describes an exothermic reaction? A Thermal energy is transferred to the surroundings leading to a decrease in the temperature of the surroundings. B Thermal energy is transferred to the surroundings leading to an increase in the temperature of the surroundings. C Thermal energy is taken in from the surroundings leading to an increase in the temperature of the surroundings. D Thermal energy is taken in from the surroundings leading to a decrease in the temperature of the surroundings.

An experiment X is carried out between a solid and a solution using the apparatus shown. The total volume of gas given off is measured at different times and the results plotted on a graph. In a second experiment Y, the surface area of the solid is increased but all other factors remain the same. Which graph shows the results of experiments X and Y?

What is shown by the symbol $\rightleftharpoons$ in the equation for a chemical reaction? A Heat is needed for the reaction to occur. B Water is needed for the reaction to occur. C A catalyst is needed to increase the rate of reaction. D The chemical reaction is reversible.

Farmers add calcium oxide (lime) and ammonium salts to their fields. The compounds are not added at the same time because they react with each other. Which gas is produced in this reaction? A ammonia B carbon dioxide C hydrogen D nitrogen

Which row identifies the universal indicator colour, pH and hydrogen ion concentration for the stated solution?

Magnesium sulfate is a soluble solid which is formed when insoluble magnesium oxide reacts with dilute sulfuric acid. Which method is used to prepare solid magnesium sulfate? A Excess sulfuric acid is reacted with magnesium oxide. The mixture is evaporated to dryness. B Excess sulfuric acid is reacted with magnesium oxide. The precipitate is filtered, washed and dried. C Sulfuric acid is reacted with excess magnesium oxide. The mixture is filtered and the filtrate is evaporated to dryness. D Sulfuric acid is reacted with excess magnesium oxide. The precipitate is filtered, washed and dried.

What is the charge on one ion of strontium, Sr? A 1+ B 2+ C 1- D 2-

Elements P, Q and R are three elements in Group I of the Periodic Table. Element P has a lower density than element Q. Element Q has a higher melting point than element R. What are elements P, Q and R?

Fluorine is the element above chlorine in Group VII of the Periodic Table. Which statements about fluorine are correct? 1 Fluorine is a solid at room temperature and pressure. 2 Iodine displaces fluorine from aqueous potassium fluoride. 3 The formula of a fluorine molecule is ${\mathrm{F}}_2$. 4 The density of fluorine is lower than the density of chlorine. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Cobalt is a transition element. What is a property of cobalt? A It forms coloured compounds. B It is a poor electrical conductor. C It has a low density. D It has a low melting point.

Which row identifies the properties that make aluminium useful as a food container? key ✓ = yes ✗ = no

Which alkali and acid react to produce a salt in which both the cation and anion are used to make a fertiliser? A ammonia and hydrochloric acid B ammonia and nitric acid C sodium hydroxide and hydrochloric acid D sodium hydroxide and nitric acid

Which row identifies properties of zinc?

A scientist investigates the rusting of nails using the apparatus shown. The nails were left for 14 days. Which statement is correct? A More rusting is shown in W than in X. B More rusting is shown in X than in Z. C More rusting is shown in Y than in Z. D More rusting is shown in Y than in W.

Which row identifies the ore of aluminium and describes its extraction method?

Water from natural sources may contain substances such as metal compounds, dissolved oxygen, phosphates and plastics. Which statement is correct? A Some metal compounds provide essential minerals for life. B Dissolved oxygen is always harmful to aquatic life. C Phosphates increase the oxygenation of the water. D Most plastics break down into harmless substances in water.

Which row identifies the source and the adverse effect of the named pollutant?

The percentage composition of gases on the planet Neptune is shown.

Which statement about the atmospheres on Neptune and on the Earth is correct? A There is more helium on Neptune than oxygen on the Earth. B There is less methane on Neptune than carbon dioxide on the Earth. C There is less hydrogen on the Earth than on Neptune. D There is more helium on the Earth than on Neptune.

Ethane, ethene, ethanol and ethanoic acid are all organic compounds. Which compounds are hydrocarbons? A ethane, ethene, ethanol and ethanoic acid B ethane and ethanol only C ethane and ethene only D ethane only

Gas oil and naphtha are two fractions obtained from petroleum. What are uses of these fractions?

Four different fuels are listed. 1 ethanol 2 petroleum 3 hydrogen 4 natural gas Which fuels are fossil fuels? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Which formula represents a compound which turns aqueous bromine colourless? A ${\mathrm{C}}_4{\mathrm{H}}_{10}$ B ${\mathrm{C}}_4{\mathrm{H}}_9\mathrm{O}\mathrm{H}$ C ${\mathrm{C}}_4{\mathrm{H}}_9\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{H}$ D ${\mathrm{C}}_4{\mathrm{H}}_8$

Which statements about ethanol are correct? 1 Ethanol is made by reacting steam with ethene at $300{}^{\circ }\mathrm{C}$. 2 Ethanol is made by fermentation at $55{}^{\circ }\mathrm{C}$. 3 Ethanol burns to produce carbon dioxide and water. 4 Ethanol contains a carbon–carbon double bond. A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4

Potassium ethanoate is made by reacting ethanoic acid with potassium hydroxide. What else is formed in the reaction? key ✓ = yes ✗ = no

The diagram shows the structure of an important product. This product is formed by ......1...... of an ......2...... . Which words complete gaps 1 and 2?

Which processes are required to separate sand from a mixture of solid sodium chloride and sand? 1 add a suitable solvent 2 filter 3 distil A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Which statement about chlorine gas is correct? A It bleaches damp blue litmus paper. B It turns damp red litmus paper blue. C It decolourises acidified aqueous potassium manganate(VII). D It turns limewater cloudy.

A solution of compound Z gives a light blue precipitate with aqueous ammonia. The precipitate dissolves in an excess of ammonia. A flame test is done on compound Z. What is the colour of the flame? A blue-green B lilac C red D yellow