Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/21 May/June 2026 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 1, May/June 2026: the question paper and its official mark scheme, 40 questions worth 40 marks. Free to open, no account needed.
- Questions
- 40
- Marks
- 40
File names: 0620_s26_qp_21 · 0620_s26_ms_21
Topics in this paper
Which syllabus chapters 0620/21 May/June 2026 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/21 May/June 2026
- Question 1
When water evaporates from a brass surface, the temperature of the brass surface decreases. Which row describes this evaporation process? 1 direction of transfer of thermal energy type of process from the brass surface to the water endothermic A from …
- Question 2
A solid lump of tin is heated until it melts. Which statements describe what happens when solid tin melts? 2 1 The atoms of tin move further apart. 2 The atoms of tin lose thermal energy to the surroundings. 3 …
- Question 3
A gas is placed in a sealed container. The gas has a pressure of one atmosphere and a temperature of 50°C. It is then heated to 100°C. Which row describes the cause of the pressure of the gas and the …
- Question 4
A sample of element X has two isotopes. The symbols for the two isotopes are 63X and 65X. The relative abundance of 65X is 25.0%. What is the relative atomic mass of …
- Question 5
Which statement about magnesium chloride, MgCl 2, is correct? 5 Molten magnesium chloride conducts electricity because its electrons are free to move. A It consists of anions and cations which have completely filled outer electron shells. B It has a …
- Question 6
Which row describes the structure of a solid metal and explains the property? 6 property of solid metal structure of solid metal conducts electricity because the electrons are free to move lattice of negative ions in a sea of electrons …
- Question 7
Which atom or ion has the electronic configuration 2,8,8? 7 Ca2+ D Br – C Na+ B Ne A
- Question 8
The formula of a compound containing element Z is Na2Z2O3. The relative formula mass of the compound is 158. What is the relative atomic mass of …
- Question 9
Magnesium reacts with steam to form hydrogen. Mg + H2O →MgO + H2 How many molecules of hydrogen gas are made when 3.6g of magnesium are heated with 1.8g of steam? (Assume Avogadro's constant …
- Question 10
Compound Y contains 48.65% carbon, 8.10% hydrogen and 43.25% oxygen by mass. What is the empirical formula of compound …
- Question 11
Calcium carbonate is reacted with an excess of dilute hydrochloric acid. CaCO3 + 2HCl →CaCl …
- Question 12
Concentrated aqueous sodium chloride and dilute sulfuric acid are electrolysed with inert electrodes. Which row describes the electrode products for each electrolyte? 12 dilute sulfuric acid concentrated aqueous sodium chloride anode cathode anode cathode oxygen hydrogen hydrogen chlorine A oxygen …
- Question 13
Which diagram shows the direction of movement of ions and electrons during the electrolysis of molten sodium chloride? 13 Cl – e– Na+ e– power supply A cathode anode Cl – e– Na+ Cl – Na+ e– power supply B …
- Question 14
Which statement about hydrogen fuel cells is correct? 14 Hydrogen fuel cells produce water as the only product. A Hydrogen fuel cells do not need oxygen. B The waste from a hydrogen fuel cell is an acidic gas. C The …
- Question 15
Which equation represents an endothermic reaction? 15 CH4(g) + 2O2(g) →CO2(g) …
- Question 16
The diagram shows the reaction pathway diagram for the reaction between X and Y to form product …
- Question 17
In a reaction, element J acts as an oxidising agent. Which statements about J are correct? …
- Question 18
Four statements about the Haber process and the Contact process are listed. 18 1 Both processes are carried out at 200kPa. 2 Both processes are carried out at 450°C. 3 Both processes use a reactant that is extracted from air. …
- Question 19
Sodium hydroxide forms an alkaline solution. Which indicator turns yellow when added to this solution? 19 litmus A methyl orange B thymolphthalein C universal indicator D
- Question 20
What is the definition of a strong acid? 20 It is a proton acceptor that is completely dissociated in aqueous solution. A It is a proton acceptor that is partially dissociated in aqueous solution. B It is a proton donor …
- Question 21
Tin(II) oxide, SnO, is amphoteric. Which reactions show that tin(II) oxide is amphoteric? 21 1 4SnO →2SnO2 + 2Sn 2 SnO + 2HCl →SnCl …
- Question 22
Which statement defines the term water of crystallisation? 22 the water molecules removed from a solution when a crystalline substance is formed A the water required to dissolve a crystalline substance to make a solution B the water molecules present …
- Question 23
The diagram shows the melting points of some Group I elements. …
- Question 24
Which row about the similarities and differences between chlorine and bromine is correct? 24 differences similarities Chlorine and bromine have different colours. Both are gases at room temperature and pressure. A Chlorine is denser than bromine. Both exist as diatomic …
- Question 25
Which property of a metal is necessary for the named use? 25 property of the metal use of the metal ductile car bodies A conducts heat cutlery B resists corrosion food containers C high density overhead electrical cables D
- Question 26
The equation for the reaction between magnesium and aqueous copper(II) sulfate is shown. Mg + CuSO4 →Cu + MgSO4 Which statement is correct? 26 Copper ions are oxidised to copper metal during the reaction. A Copper is displaced because it …
- Question 27
Steel is an alloy of iron. Zinc is used to protect a steel car body from rusting. The steel body is completely coated in zinc. Which statements about this use of zinc are correct? 27 1 The layer of zinc …
- Question 28
Which test results show that a sample of water is pure? 28 1 Its boiling point is 100°C. 2 Its freezing point is 0°C. 3 It turns anhydrous cobalt(II) chloride from blue to pink. 4 It turns anhydrous copper(II) sulfate …
- Question 29
Which mixture of salts can be used as an NPK fertiliser? 29 ammonium phosphate + potassium sulfate A calcium phosphate + sodium nitrate B potassium nitrate + calcium sulfate C sodium phosphate + ammonium nitrate D
- Question 30
Three air pollutants, X, Y and Z, are described. X is a toxic gas formed by the incomplete combustion of fossil fuels. Y is formed by decomposing vegetation and increases global warming. Z is a cause of breathing problems and …
- Question 31
Which statement about members of the carboxylic acid homologous series is correct? 31 They have the same empirical formula and similar chemical properties. A They have the same empirical formula and their displayed formula differs by a –CH2– unit. B …
- Question 32
Which of the named compounds have the correct structural formula? 32 1 ethanoic acid, CH3CH2COOH 2 propan-2-ol, CH3CH(OH)CH3 3 but-2-ene, CH3CH=CHCH3 3 only D 2 and …
- Question 33
The diagram shows a simple fractionating column for petroleum. Which outlet produces the fraction with the most viscous liquids? 33 hot petroleum …
- Question 34
Propene reacts separately with: 34 • liquid bromine, Br2 • hydrogen gas, H2 • steam, H2O. Which statement about these three reactions is correct? Two of the reactions are addition reactions and one is a substitution reaction. A The products …
- Question 35
Polymers are described as addition polymers or condensation polymers. Which two rows give a correct statement about each type of polymerisation? 35 condensation polymerisation addition polymerisation Monomers have a double bond. Monomers have different functional groups. 1 A small molecule …
- Question 36
Alanine is an amino acid. The structural formula of alanine is shown. …
- Question 37
Which statements describe an environmental challenge caused by the disposal of plastics? 37 1 The burning of the plastics can release toxic gases. 2 Plastics are harmful to marine life. 3 Plastics decompose very slowly in the environment. 2 and …
- Question 38
Magnesium reacts with dilute hydrochloric acid to produce hydrogen gas. Which pieces of apparatus are needed to determine the rate of this reaction? …
- Question 39
Solution X contains aqueous sulfite ions. Which method describes the test for the aqueous sulfite ions in X? 39 Add nitric acid to X. The gas produced turns limewater cloudy. A Add nitric acid to X. The gas produced decolourises …
- Question 40
A chemical mixture is separated using paper chromatography. The chromatogram is shown. 40 solvent front baseline Which statements are correct? 1 The spot nearest the solvent front has an Rf value greater than 0.50. 2 Insoluble compounds rise with the …
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