Cambridge IGCSE · 0620 · Paper 1 · Multiple choice (Core)
Chemistry 0620/12 Oct/Nov 2025 past paper
Cambridge IGCSE Chemistry (0620) Paper 1 (Multiple choice (Core)), variant 2, 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
- 22
File names: 0620_w25_qp_12 · 0620_w25_ms_12
Grade thresholds for 0620/12 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 |
|---|---|---|---|---|
| 22 | 19 | 17 | 14 | 11 |
Topics in this paper
Which syllabus chapters 0620/12 Oct/Nov 2025 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/12 Oct/Nov 2025
- Question 1
Water exists as solid ice, liquid water and steam. In which states can water easily be compressed to half its original volume? A ice, liquid water and steam B liquid water and steam only C liquid water only D steam …
- Question 2
The melting point of sulfur is 113 °C. Which row describes the arrangement and movement of sulfur particles at 25 °C? arrangement of particles movement of particles A regular vibrate about fixed positions B regular random C random vibrate about …
- Question 3
Solid Y is added to an excess of hot water. A blue solution forms and a brown solid remains. The brown solid is filtered off and dried. The brown solid conducts electricity. What is …
- Question 4
Which statement about the structure of an atom is correct? A Electrons and protons each have a relative mass of 1, and neutrons have no charge. B Electrons have a relative mass of 1 and a negative charge. C Protons …
- Question 5
The diagram shows the electronic configuration of a particle with a nucleon number of 40. 40 The table shows the suggestions that three students, 1, 2 and 3, made to identify the particle. student …
- Question 6
What is defined as different atoms of the same element with the same number of protons but different numbers of neutrons? A homologous series B isotopes C mass number D the group number
- Question 7
The electronic configurations of atoms Q and R are shown. …
- Question 8
Which properties are typical of simple molecules? 1 high melting point 2 good electrical conductivity 3 low boiling point 4 high malleability A 1 and …
- Question 9
Diamond is extremely hard and does not conduct electricity. Which statement explains these properties? A It has positive carbon ions surrounded by delocalised electrons. B It has strong ionic bonds between each carbon atom. C It has delocalised electrons, and …
- Question 10
Which equation represents the complete combustion of butane, …
- Question 11
What is the relative formula mass of calcium sulfate, CaSO4? …
- Question 12
What is the product at each electrode when molten silver iodide is electrolysed using inert electrodes? cathode anode A hydrogen iodine B iodine silver C silver iodine D silver oxygen
- Question 13
Which row describes a product at each electrode when dilute sulfuric acid is electrolysed using inert electrodes? product at anode product at cathode A 10 cm3 of a colourless gas 10 cm3 of a brown gas B 10 cm3 of …
- Question 14
Which experiment is the most exothermic? initial temperature / °C final temperature …
- Question 15
In which test-tube is a physical change taking place? A water iron nail B water sodium chloride C dilute hydrochloric acid dilute hydrochloric acid D calcium carbonate zinc
- Question 16
Which items of apparatus are essential when measuring the effect of temperature on the rate of any reaction? 1 balance 2 gas syringe 3 stop-watch 4 thermometer A 1 and …
- Question 17
When pink cobalt(II) chloride is heated, it forms a blue solid and water. When water is added to the blue solid, it releases heat and a pink solid is formed. Which row describes the type of reaction that occurs and …
- Question 18
What is the oxidation number of iron in iron(III) oxide, Fe2O3? …
- Question 19
Which substances react with dilute hydrochloric acid to form aqueous copper(II) chloride? 1 copper 2 copper(II) oxide 3 copper(II) carbonate 4 copper(II) hydroxide …
- Question 20
A few drops of thymolphthalein and methyl orange are added separately to two test-tubes containing solution X. Solution Y is then added to both test-tubes until present in excess. The colours of the indicators before and after addition of solution …
- Question 21
Which mixture of solids is separated by adding water, stirring, and then using filtration? A ammonium chloride and silver chloride B barium sulfate and calcium sulfate C copper(II) hydroxide and iron(III) hydroxide D potassium nitrate and sodium nitrate
- Question 22
The character of the elements and charges on the ions of the elements change across the Periodic Table. Which row describes the elements on the left and the elements on the right of the Periodic Table? elements on the left …
- Question 23
Which statement describes a general trend down Group I? A The melting point increases. B The reactivity decreases. C The density increases. D The total number of electrons decreases.
- Question 24
Which statement describes the appearance of the named halogen at room temperature and pressure? A Chlorine is a colourless gas. B Chlorine is a red-brown liquid. C Iodine is a purple gas. D Iodine is a grey-black solid.
- Question 25
Osmium is a transition element. Which row gives the expected properties of osmium? melting point density at r.t.p. compounds formed A high high coloured B high high white C high low white D low high coloured
- Question 26
Which statement about the element neon, Ne, is correct? A It is in Group VII of the Periodic Table. B It reacts rapidly with oxygen. C It exists as diatomic molecules. D Its atoms have a full outer shell of …
- Question 27
Substance G reacts with: ● dilute acids to produce hydrogen ● steam to produce a basic oxide ● oxygen to produce a basic oxide. What is substance G? A magnesium B phosphorus C silicon D silver
- Question 28
Which row describes two properties and a use of the named metal? metal property 1 property 2 use A aluminium high density resistant to corrosion food containers B aluminium low density good electrical conductivity overhead power cables C copper good …
- Question 29
Four methods to prevent the rusting of iron are listed. 1 alloying 2 coating with plastic 3 greasing 4 painting Which methods are barrier methods? …
- Question 30
Iron is extracted from hematite in a blast furnace. Which reaction involves thermal decomposition? A Calcium carbonate reacts to form calcium oxide and carbon dioxide. B Carbon (coke) reacts with oxygen to form carbon dioxide. C Carbon dioxide reacts with …
- Question 31
Clean, dry air contains nitrogen, oxygen and small amounts of other gases. The noble gases have been left out of the table. Which row shows the composition of clean, dry air? nitrogen / % oxygen / % other gases …
- Question 32
Some substances found in water from natural sources are potentially harmful. Which substance contains microbes that cause disease? A metal compounds B nitrates C phosphates D sewage
- Question 33
Gas X is a waste gas from digestion in animals. Gas Y is formed when gas X is burned with an insufficient amount of oxygen. Gas Z is formed when gas X is burned with an excess of oxygen. What …
- Question 34
Which statement about photosynthesis is correct? A It decreases the amount of oxygen in the atmosphere. B It is a reaction between carbon dioxide and water. C It produces a gas that contributes to increased global warming. D It requires …
- Question 35
L and M are different homologous series. The first three members of homologous series L all decolourise aqueous bromine. The first three members of homologous series M all dissolve in water to give solutions with a pH below 7. What …
- Question 36
Which structure represents an unsaturated hydrocarbon? …
- Question 37
Petroleum is a mixture of compounds. Which elements are present in all of these compounds? 1 carbon 2 hydrogen 3 oxygen …
- Question 38
Which statement about ethanol explains why it is used as a fuel? A It is a colourless liquid. B It has a low density. C It forms carbon dioxide when burned. D It releases energy when burned.
- Question 39
The table shows the observations of two tests on an aqueous solution of a solid. test observations add acidified silver nitrate white precipitate add aqueous sodium hydroxide green precipitate that dissolves in excess sodium hydroxide What is the solid? A …
- Question 40
W is a mixture of coloured dyes. It is thought to contain dyes …
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