IGCSE Chemistry 0620 Paper 11, May/June 2026

At temperature T1, particles of substance X are close together and slide over each other. At temperature T2, substance X is made up of particles that are close together and vibrate in fixed positions. What is the name of the change of state substance X undergoes when its temperature changes from T1 to T2? A melting B boiling C freezing D condensing

Nitrogen is heated in a balloon which expands slightly. Which statements about the molecules of nitrogen are correct? 1 They move further apart. 2 They move more quickly. 3 They remain the same distance apart. 4 Their speed remains unchanged. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Which row about elements, mixtures and compounds is correct?

The table gives information about some atoms and ions. Which row describes the ion with the largest mass?

Which statement defines atomic number? A It is the total number of protons in the nucleus of an atom. B It is the total number of protons and neutrons in the nucleus of an atom. C It is the number of different atoms in one molecule. D It is the simplest whole number ratio of atoms in a compound.

Which symbol represents an isotope of the main element present in stainless steel? A ${}_6^{12}\mathrm{W}$ B ${}_{12}^{24}\mathrm{X}$ C ${}_{24}^{50}\mathrm{Y}$ D ${}_{26}^{57}\mathrm{Z}$

Which statement describes the bonding in potassium chloride? A Two electrons are shared between two atoms. B Two electrons are shared between two oppositely charged ions. C There is a strong electrostatic attraction between electrons in two different atoms. D There is a strong electrostatic attraction between two oppositely charged ions.

Which row describes the hardness and a use of graphite?

What is the formula of potassium oxide? A ${\mathrm{P}}_2\mathrm{O}$ B ${\mathrm{P}\mathrm{O}}_2$ C $\mathrm{K}\mathrm{O}$ D ${\mathrm{K}}_2\mathrm{O}$

Which compound contains the greatest number of atoms in its formula? A copper(II) sulfate B ethane C ethanol D sulfuric acid

Which formula gives the $M_{\mathrm{r}}$ of lead(II) bromide? A $A_{\mathrm{r}}\text{ lead}+A_{\mathrm{r}}\text{ bromine}$ B $A_{\mathrm{r}}\text{ lead}+2\times A_{\mathrm{r}}\text{ bromine}$ C $2\times A_{\mathrm{r}}\text{ lead}+A_{\mathrm{r}}\text{ bromine}$ D $2\times A_{\mathrm{r}}\text{ lead}+2\times A_{\mathrm{r}}\text{ bromine}$

Which statements about the electrolysis of dilute sulfuric acid using inert electrodes are correct? 1 Oxygen and sulfur are formed at the positive electrode. 2 Hydrogen is formed at the negative electrode. 3 Oxygen is formed at the anode. 4 Sulfuric acid can be electrolysed because it is a covalent compound. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Fuel cells are used as energy sources in cars. Which row gives a fuel used in a fuel cell and the products formed?

The reaction pathway diagram for the reaction between hydrogen and iodine to form hydrogen iodide is shown. Four statements about this reaction are listed. 1 The reaction is exothermic. 2 The reaction is endothermic. 3 The temperature of the mixture increases during the reaction. 4 The temperature of the mixture decreases during the reaction. Which statements are correct? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Which row describes a chemical change?

Zinc is reacted with dilute sulfuric acid to produce hydrogen gas. The acid is poured through a funnel into a conical flask containing zinc. Which apparatus could be used to measure the total volume of gas produced? A B C D

Which statement about cobalt(II) chloride and copper(II) sulfate is correct? A The blue form of cobalt(II) chloride is hydrated. B The pink form of cobalt(II) chloride is chemically combined with water. C The white form of copper(II) sulfate contains water. D The blue form of copper(II) sulfate is anhydrous.

When heated strongly, silicon(IV) oxide reacts with carbon. $${\mathrm{S}\mathrm{i}\mathrm{O}}_2+2\mathrm{C}\to \mathrm{S}\mathrm{i}+2\mathrm{C}\mathrm{O}$$ Which term describes what happens to silicon(IV) oxide? A thermal decomposition B neutralisation C oxidation D reduction

Potassium manganate(VII), ${\mathrm{K}\mathrm{M}\mathrm{n}\mathrm{O}}_4$, is a compound with a range of different uses. What does (VII) indicate about this compound? A The oxidation number of potassium in this compound is –7. B The oxidation number of potassium in this compound is +7. C The oxidation number of manganese in this compound is –7. D The oxidation number of manganese in this compound is +7.

Thymolphthalein and methyl orange are separately added to test-tubes containing aqueous potassium hydroxide. What is the final colour of the solution in each test-tube?

Copper(II) chloride is made when copper(II) carbonate reacts with dilute hydrochloric acid. What are the other products in this reaction? A water and carbon dioxide B carbon dioxide only C water and hydrogen D hydrogen only

Dilute acid HA has a pH of 2 and dilute acid HX has a pH of 4. Both acids have the same concentration. Which statement is correct? A HA is more acidic than HX and the hydrogen ion concentration of HA is greater than that of HX. B HA is less acidic than HX and the hydrogen ion concentration of HA is greater than that of HX. C HA is less acidic than HX and the hydrogen ion concentration of HA is less than that of HX. D HA is more acidic than HX and the hydrogen ion concentration of HA is less than that of HX.

Which oxide forms a basic solution in water? A carbon dioxide B nitrogen dioxide C sodium oxide D sulfur dioxide

Copper(II) sulfate is prepared by adding copper(II) oxide to dilute sulfuric acid. The steps used to obtain copper(II) sulfate crystals are listed. 1 Warm the filtrate until concentrated. 2 Filter the mixture. 3 Heat the mixture and stir. 4 Leave to cool. What is the correct order of these steps? A 2 → 1 → 3 → 4 B 1 → 2 → 4 → 3 C 3 → 2 → 1 → 4 D 3 → 2 → 4 → 1

The elements in a group of the Periodic Table show the following trends. 1 The element with the lowest proton number has the lowest reactivity. 2 All the elements in the group form basic oxides. 3 The density of the elements increases down the group. 4 The melting point of the elements decreases down the group. In which group are the elements found? A I B IV C VI D VII

Which statements about noble gases are correct? 1 Their atoms have complete outer shells of electrons. 2 They exist as diatomic molecules. 3 They are in Group VIII of the Periodic Table. 4 They react with oxygen to give an acidic oxide. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Which substances have a high melting point and conduct electricity when solid? 1 zinc 2 diamond 3 sulfur 4 graphite A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Which metal is used in aircraft manufacture because it has a low density? A aluminium B copper C iron D potassium

Which statements explain why stainless steel is used to make cutlery? 1 It is a good conductor of thermal energy. 2 It is ductile. 3 It is corrosion resistant. 4 It is hard. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Nickel reacts with dilute hydrochloric acid. The reaction is slower than the reaction of iron with dilute hydrochloric acid. Strontium reacts with cold water more slowly than sodium reacts with cold water, but faster than iron reacts with cold water. Which statement correctly describes the order of reactivity? A Nickel is the most reactive and strontium is the least reactive. B Strontium is the most reactive and iron is the least reactive. C Iron is the most reactive and strontium is the least reactive. D Sodium is the most reactive and nickel is the least reactive.

Why is distilled water used in practical chemistry rather than tap water? A It has a higher boiling point than tap water. B It has a lower melting point than tap water. C It has fewer impurities than tap water. D It contains more ions than tap water.

An NPK fertiliser is made by mixing two compounds. One of the compounds is $\mathrm{C}\mathrm{a}({\mathrm{H}}_2{\mathrm{P}\mathrm{O}}_4{)}_2$. What is the other compound? A potassium nitrate B potassium sulfate C sodium chloride D ammonium nitrate

Which row identifies the reactants and products of photosynthesis?

The structures of four different organic compounds are shown. How many different homologous series are represented by these compounds? A 1 B 2 C 3 D 4

The names of organic compounds with seven carbon atoms in a chain start with ‘hept’. What is the name of this compound? A heptane B heptanol C heptene D heptanoic acid

Natural gas is a combustible gas that is a mixture of simple hydrocarbon compounds. Which substance is the main constituent of natural gas? A methane B butane C carbon monoxide D carbon dioxide

A large alkane is cracked to produce smaller hydrocarbons. The formulas of three of these hydrocarbons are shown. $${\mathrm{C}}_3{\mathrm{H}}_6{\mathrm{C}}_2{\mathrm{H}}_6{\mathrm{C}}_4{\mathrm{H}}_8$$ Which compounds decolourise aqueous bromine? A ${\mathrm{C}}_3{\mathrm{H}}_6$ and ${\mathrm{C}}_2{\mathrm{H}}_6$ B ${\mathrm{C}}_3{\mathrm{H}}_6$ and ${\mathrm{C}}_4{\mathrm{H}}_8$ C ${\mathrm{C}}_2{\mathrm{H}}_6$ only D ${\mathrm{C}}_4{\mathrm{H}}_8$ only

Which statements are correct? 1 The polymer of ethene is poly(ethane). 2 Monomers are small molecules. 3 Monomers join together to form polymers. A 1 and 3 B 1 only C 2 and 3 D 2 only

Which piece of apparatus is used to measure accurately the volume of a liquid in an acid–base titration? A a balance B a beaker C a burette D a conical flask

Aqueous X reacts with aqueous $\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$ to produce a white precipitate that is soluble in excess aqueous $\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$. Aqueous X reacts with acidified aqueous $\mathrm{B}\mathrm{a}({\mathrm{N}\mathrm{O}}_3{)}_2$ to produce a white precipitate. What is X? A ${\mathrm{M}\mathrm{g}\mathrm{S}\mathrm{O}}_4$ B ${\mathrm{Z}\mathrm{n}\mathrm{S}\mathrm{O}}_4$ C ${\mathrm{C}\mathrm{a}\mathrm{C}\mathrm{l}}_2$ D ${\mathrm{A}\mathrm{l}\mathrm{C}\mathrm{l}}_3$