Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/23 May/June 2026 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 3, 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_23 · 0620_s26_ms_23
Topics in this paper
Which syllabus chapters 0620/23 May/June 2026 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/23 May/June 2026
- Question 1
Gaseous ammonia reacts with an excess of gaseous hydrogen chloride in a sealed flask. NH3(g) + HCl(g) →NH4Cl(s) The reaction is exothermic. Which statements about the reaction are correct? 1 1 The number of gas particles in the flask decreases. …
- Question 2
X and Y are changes of state of water. 2 ice liquid water water vapour X Y Which row identifies X and …
- Question 3
A syringe contains a fixed mass of gas. The plunger of the syringe is free to move. Which row describes how the distance between the particles of the gas changes when the temperature or pressure is reduced? 3 reduced pressure …
- Question 4
Which substance is a pure compound? 4 air A brass B ethanol C petroleum D
- Question 5
The diagram shows the structure of an atom of element …
- Question 6
Which statement about an atom or an ion is correct? 6 In an atom, the number of electrons is equal to the atomic number. A In an atom, the number of neutrons is equal to the atomic number. B In …
- Question 7
Which statement explains the high melting point of potassium bromide? 7 There is strong covalent bonding between the molecules. A There is strong ionic bonding between the ions. B There are strong intermolecular forces between the molecules. C There are …
- Question 8
Magnesium is in Group II and sulfur is in Group VI of the Periodic Table. They react to form magnesium sulfide. Which dot-and-cross diagram shows the outer electrons in magnesium sulfide? 8 Mg …
- Question 9
Graphite is a form of carbon. Why can graphite be used as a lubricant? 9 Graphite contains unbonded electrons which move through the structure. A Graphite contains weak covalent bonds, so the atoms move easily. B Graphite has a low …
- Question 10
The formula of an aluminium ion is Al 3+. The formula of a nitrate ion is NO3 –. What is the formula of aluminium nitrate? 10 Al(NO3)3 D Al 3NO3 C Al(NO3)2 B AlNO3 …
- Question 11
Organic compound X has the following percentage composition by mass. carbon 60%; hydrogen 8%; oxygen 32% What is the empirical formula of compound …
- Question 12
The equation for the reaction of dilute sulfuric acid and aqueous sodium hydroxide is shown. H2SO4 + 2NaOH →Na2SO4 + 2H2O 25.0cm3 of aqueous sodium hydroxide is measured into a conical flask. 12.5cm3 of 0.100mol/dm3 sulfuric acid is needed to …
- Question 13
What is the total number of atoms in 0.0100mol of methane, CH4? (The value of the Avogadro constant is …
- Question 14
Dilute sulfuric acid is electrolysed using carbon electrodes. Which row shows the products that are formed at each electrode? 14 cathode anode oxygen hydrogen A sulfur hydrogen B hydrogen oxygen C sulfur oxygen …
- Question 15
Substance Z is electrolysed with inert electrodes. The only product at the positive electrode is a gas which bleaches damp blue litmus paper. The only product at the negative electrode is a gas which gives a squeaky pop when it …
- Question 16
Aluminium is manufactured from aluminium oxide by electrolysis. Which row shows the ionic half-equations at each electrode and describes the role of cryolite in the process? 16 role of cryolite reaction at cathode reaction at anode catalyst Al …
- Question 17
The equation for the reaction between hydrogen and chlorine is shown. H2(g) + Cl 2(g) →2HCl(g) The energy required to break the H–H bond is 436kJ /mol. The energy required to break the Cl–Cl bond is 242kJ /mol. The energy …
- Question 18
Magnesium reacts with hydrochloric acid to form magnesium chloride and hydrogen. Why does magnesium powder react faster than magnesium ribbon? 18 The magnesium atoms in the powder have a lower activation energy. A The powder has a smaller surface area. …
- Question 19
The equation for one of the reactions in the Contact process is shown. 2SO2(g) + O2(g) ⇋2SO3(g) ∆H = –196kJ /mol Which statement about this reaction is correct? 19 The typical conditions are a temperature of 450°C and a pressure …
- Question 20
Which row describes the effect of a catalyst on a reaction? 20 A effect on activation energy, Ea effect on enthalpy change, H decreases decreases B decreases no change C increases decreases D increases no change
- Question 21
The ionic equation for the reaction of aqueous iron(II) sulfate with acidified aqueous potassium manganate(VII) is shown. 5Fe2+ + MnO4 …
- Question 22
Which statement about ethanoic acid is correct? 22 It is a weak acid that does not react with magnesium. A It is made by oxidising ethanol with aqueous sodium carbonate. B It reacts with an ester to form an alcohol. …
- Question 23
Four oxides are listed. 23 • calcium oxide • copper(II) oxide • sulfur dioxide • zinc oxide Which statement about these oxides is correct? All of them contain oxide ions. A Only three of them are reduced by carbon to …
- Question 24
Which salt is insoluble in water? 24 barium sulfate A lead(II) nitrate B magnesium chloride C sodium carbonate …
- Question 25
The noble gases are in Group VIII of the Periodic Table. Some properties of the first four noble gases are shown. 25 density in g/dm3 boiling point /°C noble gas 0.179 –267 helium 0.900 –246 neon 1.782 –186 argon 3.708 …
- Question 26
The table shows some physical properties of four different substances. Which row describes the properties of a non-metallic element? 26 conductivity when melted conductivity when solid melting point /°C good good 63 A poor poor 119 B good good 659 …
- Question 27
Which properties of aluminium make it useful in the manufacture of aircraft bodies? 27 1 It has good electrical conductivity. 2 It is resistant to corrosion. 3 It has a low density. 2 and 3 only D 1 and 3 …
- Question 28
Four mixtures are listed. 28 1 Cu2+(aq) + Ag(s) 2 Zn(s) + Fe2+(aq) 3 Cu2+(aq) + Mg(s) 4 Cu(s) + Ag+(aq) Which mixtures would lead to a reaction? 2 and 4 only …
- Question 29
A blue anhydrous substance is used to test for the presence of water. When water is added to this substance, it changes colour. What is the anhydrous substance and what is its colour after the addition of water? 29 colour …
- Question 30
Which gas is found in clean, dry air? 30 carbon monoxide A carbon dioxide B nitrogen dioxide C sulfur dioxide D
- Question 31
Which statement describes how the C–H bonds in methane gas in the atmosphere contribute to global warming? 31 They absorb thermal energy from the Sun and emit some of this energy into space. A They absorb thermal energy from the …
- Question 32
The formulas of three hydrocarbons are listed. 32 1 CH3CH(CH3)CH3 2 CH3CH2CH2CHCH2 3 CH3CH2CH2CH2CH3 Which compounds are members of the same homologous series? 2 and 3 only D 1 and 3 only C 1 and 2 only …
- Question 33
Which row gives the correct structural and displayed formula of the named organic molecule? 33 name of organic molecule A propan-2-ol CH3CH2(OH)CH3 B propan-1-ol CH3CH(OH)CH3 C butan-2-ol CH3C(OH)2CH2CH3 D butan-1-ol CH3CH2CH2CH2OH structural formula displayed formula …
- Question 34
Which equation describes an addition reaction? …
- Question 35
Which reaction is used to make ethanol? 35 adding steam to ethene A addition polymerisation B fractional distillation of petroleum C reacting ethene with aqueous bromine D
- Question 36
Which structure represents a protein? …
- Question 37
Which structure represents the repeat unit of the addition polymer formed from but-1-ene? …
- Question 38
A student measures the rate of two reactions. In one reaction, there is a change in mass of the reactants during the reaction. In the second reaction, there is a change in temperature during the reaction. Which piece of apparatus …
- Question 39
The diagram shows a chromatography experiment. Which label shows the solvent front? …
- Question 40
Which row shows the reagents that are used to test for the chloride ion and for the sulfate ion? 40 sulfate chloride aqueous acidified barium nitrate aqueous acidified silver nitrate A aluminium foil and aqueous sodium hydroxide aqueous acidified barium …
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