Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/23 Oct/Nov 2025 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 3, Oct/Nov 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
- 26
File names: 0620_w25_qp_23 · 0620_w25_ms_23
Grade thresholds for 0620/23 Oct/Nov 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 |
|---|---|---|---|---|---|---|
| 26 | 23 | 20 | 18 | 16 | 14 | 12 |
Topics in this paper
Which syllabus chapters 0620/23 Oct/Nov 2025 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/23 Oct/Nov 2025
- Question 1
What happens to the volume of a fixed mass of gas when pressure and temperature are separately increased? volume of gas pressure increased temperature increased A increases increases B no change decreases C decreases increases D no change increases
- Question 2
Which gas diffuses most quickly at room temperature and pressure? A CH4 …
- Question 3
Which statement defines nucleon number? A It is the total number of protons in the nucleus of an atom. B It is the total number of electrons surrounding the nucleus of an atom. C It is the total number of …
- Question 4
The symbols of four atoms are listed. …
- Question 5
Which statement describes all positive ions? A Positive ions have more electrons than neutrons. B Positive ions have more protons than neutrons. C Positive ions have more electrons than protons. D Positive ions have more protons than electrons.
- Question 6
A sample of copper has a relative atomic mass of 63.5. What are the relative abundances of the isotopes in this sample of copper? A 25% 63Cu and 75% 65Cu B 50% 63Cu and 50% 65Cu C 75% 63Cu and …
- Question 7
Which diagram shows the outer shell electron arrangement for a molecule of methanol, CH3OH? …
- Question 8
Rescuers are drilling through fallen rock in order to rescue some people trapped in a cave. The drill needs lubricating from time to time. Four statements are made about the materials used for the drill tip and the lubricant to …
- Question 9
Which compound has an empirical formula that is the same as its molecular formula? A butane B but-1-ene C butanoic acid D butan-1-ol
- Question 10
Which row identifies the charge on the chromium ion and on the sulfate ion in Cr2(SO4)3? Cr SO4 …
- Question 11
Which statement describes a saturated solution? A It is a solution that contains the maximum concentration of solute. B It is a solution that contains the maximum amount of solvent. C It is a hydrocarbon that contains both double and …
- Question 12
Calcium carbonate decomposes when heated strongly. CaCO3(s) CaO(s) + CO2(g) How many gaseous molecules are produced when 10.0 g of calcium carbonate is completely decomposed? …
- Question 13
Which product is initially obtained at each electrode during the electrolysis of concentrated aqueous sodium chloride? cathode anode A hydrogen chlorine B hydrogen oxygen C sodium chlorine D sodium oxygen
- Question 14
Molten lead(II) bromide is electrolysed using inert electrodes. …
- Question 15
In a fuel cell, a fuel is oxidised to produce electricity. Which row describes the fuel and the oxidising agent used? fuel oxidising agent A nitrogen oxygen B hydrogen oxygen C nitrogen water D hydrogen water
- Question 16
Which statement about reactions is correct? A A reaction that is vigorous at room temperature has a high activation energy. B If H for a reaction is positive, bond making in the formation of the products is endothermic. C In …
- Question 17
Ethene reacts with hydrogen to form ethane. …
- Question 18
Zinc reacts with dilute hydrochloric acid. Which statement about the particles in the reaction is correct? A Increasing the concentration of dilute hydrochloric acid increases the collision rate but has no effect on the activation energy. B Increasing the concentration …
- Question 19
Ethanol is manufactured by the addition of steam to ethene. …
- Question 20
Which row identifies the conditions used to make sulfur trioxide in the Contact process? pressure / kPa catalyst A 200 iron B 200 vanadium(V) oxide …
- Question 21
Which statement describes a base? A It reacts with ammonium chloride to produce ammonia gas. B It reacts with calcium carbonate to produce carbon dioxide gas. C It reacts with copper to produce hydrogen gas. D It turns blue litmus …
- Question 22
The equation shows the reaction between copper and concentrated nitric acid. Cu(s) + 4HNO3(aq) Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) Which element is reduced in this reaction? A oxygen B nitrogen C copper D hydrogen
- Question 23
The Periodic Table shows the position of four different elements. …
- Question 24
Dilute acid R and dilute acid S have the same concentration. The same volume of each dilute acid is reacted separately with the same mass of magnesium ribbon. Both reactions are carried out at room temperature and pressure. The volume …
- Question 25
Which metal oxide reacts with aqueous sodium hydroxide to form a salt and water? A calcium oxide B copper(II) oxide C sodium oxide D aluminium oxide
- Question 26
Which row identifies a transition element? melting point density at r.t.p. A high high B high low C low high D low low
- Question 27
Which statement about Group I or Group VII elements is correct? A Group VII elements are monatomic non-metals. B Lithium is more reactive with water than caesium. C The melting point of Group I metals increases down the group. D …
- Question 28
Some information about four metals …
- Question 29
Cars are fitted with catalytic converters. Which equation represents a reaction that takes place in a catalytic converter? A CO2 + NO2 CO + NO …
- Question 30
Three statements about greenhouse gases and global warming are listed. 1 A greenhouse gas molecule can absorb and emit thermal energy. 2 The Earth is a source of thermal energy. 3 Thermal energy emitted by a greenhouse gas molecule is …
- Question 31
Which type of reaction takes place when methane reacts with chlorine in the presence of ultraviolet light? A addition B cracking C polymerisation D substitution
- Question 32
Iron is extracted from iron(III) oxide in the blast furnace. Three steps in the process are listed. 1 Carbon (coke) is completely oxidised. 2 Iron(III) oxide is reduced. 3 Carbon dioxide is reduced to carbon monoxide. What is the correct …
- Question 33
Three different reactions that occur during the extraction of aluminium from purified bauxite are listed. 1 Al …
- Question 34
Which statement about aqueous ethanoic acid is correct? A It reacts with magnesium to form oxygen gas. B It reacts with sodium carbonate to form carbon dioxide gas. C It turns red litmus paper blue. D It turns methyl orange …
- Question 35
The diagrams represent four monomers. H2N NH2 HOOC NH2 HO NH2 HO OH The monomers each react in …
- Question 36
Propene undergoes addition reactions with bromine, hydrogen and steam. Which structures represent a product of these reactions? H C Br …
- Question 37
The structures of four compounds are shown. …
- Question 38
Which statement about ethanoic acid is correct? A Ethanol is reduced by bacteria to produce ethanoic acid. B Ethanoic acid reacts with magnesium to produce a salt of formula CH3COOMg. C Ethanoic acid and methanol react in the presence of …
- Question 39
Substance X contains one cation. Two tests are completed on aqueous X. test 1 flame test test 2 addition of aqueous sodium hydroxide dropwise and then in excess Which row shows a possible combination of observations for the tests? observation …
- Question 40
A colourless mixture is separated by paper chromatography. The steps below describe the method. These steps are not in the correct order. 1 Remove the chromatography paper from the solvent when the solvent front is near the top of the …
Other Chemistry papers from Oct/Nov 2025
- 0620/11 Multiple choice (Core)
- 0620/12 Multiple choice (Core)
- 0620/13 Multiple choice (Core)
- 0620/21 Multiple choice (Extended)
- 0620/22 Multiple choice (Extended)
- 0620/31 Theory (Core)
- 0620/32 Theory (Core)
- 0620/33 Theory (Core)
- 0620/41 Theory (Extended)
- 0620/42 Theory (Extended)
- 0620/43 Theory (Extended)
- 0620/61 Alternative to Practical
- 0620/62 Alternative to Practical
- 0620/63 Alternative to Practical