Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/23 May/June 2025 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 3, May/June 2025: the question paper and its official mark scheme, 40 questions worth 40 marks, with the grade thresholds. Free to open, no account needed.
- Questions
- 40
- Marks
- 40
- Grade A from
- 30
File names: 0620_s25_qp_23 · 0620_s25_ms_23
Grade thresholds for 0620/23 May/June 2025
The minimum raw marks Cambridge set for each grade on this component (out of 40). Thresholds change every session and variant, so always compare your score with the paper you actually sat.
| A | B | C | D | E | F | G |
|---|---|---|---|---|---|---|
| 30 | 25 | 20 | 18 | 16 | 14 | 12 |
Topics in this paper
Which syllabus chapters 0620/23 May/June 2025 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/23 May/June 2025
- Question 1
Which two changes, when applied at the same time to a fixed amount of gas, cause the greatest increase in volume of the gas? change in pressure change in temperature A decrease by 10% decrease by 10% B increase by …
- Question 2
Solid G is heated until it melts. It is then left to cool to room temperature. The graph shows the cooling curve for …
- Question 3
Which atom has twice as many neutrons as protons? …
- Question 4
What is the nucleon number of an atom? A the number of electrons, neutrons and protons in the nucleus B the number of neutrons and protons in the nucleus C the number of neutrons in the nucleus D the number …
- Question 5
The diagram shows the positions of elements P and Q in the Periodic Table. P Q What is the formula of the compound that is formed between P and Q? A PQ …
- Question 6
Which statement about ionic compounds is correct? A Giant lattices are formed when ionic compounds crystallise from solution. B In all ionic compounds, the metal ions have fewer electrons than the non-metal ions. C In a giant lattice, ions of …
- Question 7
The equation for the reaction between iron(III) chloride and sodium hydroxide is shown. FeCl 3(aq) + 3NaOH(aq) Fe(OH)3(s) + 3NaCl (aq) What is the ionic equation for this reaction? A Fe3+(aq) + 3OH–(aq) Fe3+(s) + 3OH–(s) B Fe3+(aq) …
- Question 8
A compound is analysed and found to contain 85.7% carbon and 14.3% hydrogen only. What is its empirical formula? A CH B CH2 …
- Question 9
Aqueous barium hydroxide, Ba(OH)2, reacts with dilute nitric acid, HNO3. The products are aqueous barium nitrate, Ba(NO3)2, and water. In a titration, 15.2 cm3 of 0.75 mol / dm3 aqueous barium hydroxide is required to neutralise 20.0 cm3 of dilute …
- Question 10
Which particles are responsible for the transfer of charge in the external circuit during the electrolysis of molten lead(II) bromide? A anions B atoms C cations D electrons
- Question 11
Two statements about hydrogen are listed. 1 Hydrogen is used as a fuel. 2 When hydrogen burns in the air to form water, thermal energy is produced. Which conclusion about these statements is correct? A Both statements are correct, and …
- Question 12
Concentrated aqueous copper(II) chloride is electrolysed using carbon electrodes. What is formed at each electrode? negative electrode positive electrode A chlorine copper B copper chlorine C copper oxygen D oxygen copper
- Question 13
Which row describes an exothermic reaction? sign of enthalpy change, H temperature of the surroundings A positive decreases B positive increases C negative decreases D negative increases
- Question 14
A reaction pathway diagram is shown. reactants products energy progress of reaction X Y Which row shows the correct labels for X and Y and the type of reaction taking place? X Y type of reaction A enthalpy change activation …
- Question 15
The rate of reaction between magnesium and dilute hydrochloric acid is increased by increasing the concentration of the acid. How does this affect the reacting particles? collision rate of particles proportion of particles with sufficient energy to react A increases …
- Question 16
The reaction between aqueous iron(III) ions, Fe3+, and aqueous thiocyanate ions, SCN–, is reversible. The equation for the reaction is shown. Fe3+(aq) + SCN–(aq) FeSCN2+(aq) yellow colourless red At equilibrium, the concentrations of Fe3+ ions, SCN– ions, and FeSCN2+ ions …
- Question 17
The equation for the reaction between iron(II) sulfate and bromine is shown. 6FeSO4 + 3Br2 2Fe2(SO4)3 + 2FeBr3 Which row identifies the oxidising agent and the reducing agent? oxidising agent reducing agent A Br2 FeSO4 B FeSO4 Br2 C …
- Question 18
The equation represents a redox reaction. 2Al + Fe2O3 2Fe + Al 2O3 What is the change in the oxidation number of iron in this reaction? A from +2 to +3 B from +2 to 0 C from +3 …
- Question 19
Aqueous ammonia forms an equilibrium with water. NH3 + H2O NH4 + + OH– In this equilibrium, which particle acts as an acid and which particle acts as a base? acid base A NH3 H2O B NH3 OH– C H2O …
- Question 20
Which row identifies an acidic oxide, a basic oxide and an amphoteric oxide? acidic basic amphoteric A ZnO SO2 Al 2O3 B SO2 Al 2O3 Na2O C ZnO Al 2O3 SO2 D SO2 Na2O Al 2O3
- Question 21
A Group I metal (lithium or potassium) is reacted with a Group VII element (chlorine or iodine). Which compound is formed when the Group I metal of highest density reacts with the Group VII element of lowest density? A potassium …
- Question 22
Element X is in the same group of the Periodic Table as silicon. An atom of element X has more protons than a silicon atom. Which element could be X? A aluminium B carbon C germanium D phosphorus
- Question 23
Which statement about the elements in Group VIII is correct? A They all form diatomic molecules. B They all have eight electrons in their outer electron shells. C They all react with oxygen to form oxides. D They all are …
- Question 24
Which element is a transition element? melting point in °C density at r.t.p. in g / cm3 colour of oxide at …
- Question 25
Four test-tubes contain dilute hydrochloric acid. Each test-tube has one piece of a different metal added to it. The metals are copper, iron, magnesium and zinc. Which test-tube contains iron and dilute hydrochloric acid? …
- Question 26
Brass is a mixture of copper and zinc. Which statement describes and explains the relative strength of brass compared to copper? A Brass is stronger than copper because the layers of atoms in brass cannot easily slide over each other. …
- Question 27
A sample of calcium carbonate is heated strongly, and substances U and V are formed. Substance U is a white solid. Substance V is a colourless gas. What are substances U and …
- Question 28
A sample of water taken from a river contains harmful microbes. What is a source of harmful microbes in the river water? A sewage B fertilisers C detergents D plastics
- Question 29
Anhydrous copper(II) sulfate and anhydrous cobalt(II) chloride change colour when water is added to them. Which row shows the correct colour changes? copper(II) sulfate cobalt(II) chloride A blue to white blue to pink B blue to white pink to blue …
- Question 30
Which gas contributes to increased global warming? A argon B carbon dioxide C nitrogen D oxygen
- Question 31
Which statement describes how greenhouse gases increase global warming? A Greenhouse gases absorb thermal energy from the Sun, reducing the Earth’s temperature. B Greenhouse gases reflect thermal energy back into space, cooling the Earth’s surface. C Greenhouse gases absorb and …
- Question 32
Nitrogen monoxide is produced in a car engine when petrol is burned. The gases from the car engine are passed through a catalytic converter. In the catalytic converter, the nitrogen monoxide, NO, reacts with carbon monoxide, CO, to form nitrogen …
- Question 33
The displayed formula of but-2-ene is shown. …
- Question 34
Which row describes two characteristics of members of the same homologous series? characteristic 1 characteristic 2 A same functional group trend in physical properties B same physical properties same functional group C same general formula different chemical properties D differing …
- Question 35
Compound W is a hydrocarbon that contains single bonds only. Which homologous series contains W? A alkenes B alkanes C carboxylic acids D alcohols
- Question 36
Methane forms chloromethane in a photochemical reaction using ultraviolet light. Which statement about this reaction is correct? A Methane is mixed with hydrogen chloride gas, and ultraviolet light prevents a combustion reaction. B Methane is mixed with hydrogen chloride gas, …
- Question 37
Which statement about polymers is correct? A Nylon contains the linkage. B Nylon is a polyester. C Propane can be polymerised by addition polymerisation. D The linkage in PET contains a carbon–carbon double bond. …
- Question 38
The steps used to separate a mixture of a soluble solid and an insoluble solid are listed. ● A solution is made by adding the mixture to a suitable …
- Question 39
Which items of apparatus are used to separate a mixture of liquids with different boiling points? …
- Question 40
In paper chromatography, what is the equation for the Rf value? A Rf = substance by travelled distance solvent by travelled distance B Rf = substance by travelled distance agent locating by travelled distance C Rf = agent locating by …
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