Cambridge O Level · 5070 · Paper 1 · Multiple choice
Chemistry 5070/12 Oct/Nov 2025 past paper
Cambridge O Level Chemistry (5070) Paper 1 (Multiple choice), 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
- 25
File names: 5070_w25_qp_12 · 5070_w25_ms_12
Grade thresholds for 5070/12 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 |
|---|---|---|---|---|
| 25 | 21 | 16 | 14 | 13 |
Topics in this paper
Which syllabus chapters 5070/12 Oct/Nov 2025 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 5070/12 Oct/Nov 2025
- Question 1
Separate samples of water and air each have a volume of 30 cm3 at room temperature and pressure. The pressure applied to both samples is increased by the same amount at room temperature. Which row describes the volumes at the …
- Question 2
Why does a balloon full of helium gas become smaller as the temperature changes from 30 °C to …
- Question 3
Atom X has an atomic number of 19 and a nucleon number of 42. Atom Y has an atomic number of 20 and a nucleon number of 40. Which statement is correct? A Atom X contains two more electrons than …
- Question 4
In which ionic compound do all the ions have the same electronic configuration? A beryllium sulfide B lithium fluoride C magnesium chloride D sodium oxide
- Question 5
Which ion has a positive charge? A ammonium B carbonate C manganate(VII) D sulfite
- Question 6
Which row is correct? structure and bonding of hydrogen chloride structure and bonding of diamond A giant covalent giant covalent B giant covalent simple molecular C simple molecular giant covalent D simple molecular simple molecular
- Question 7
Powdered calcium carbonate reacts with dilute hydrochloric acid to produce calcium chloride, water and carbon dioxide. What is the correct ionic equation, including state symbols, for this reaction? A CaCO3(s) + 2HCl (aq) CaCl 2(aq) …
- Question 8
Which structure shows the carboxylic acid with the lowest relative molecular mass? …
- Question 9
A mixture of 2 g of hydrogen and 32 g of oxygen occupies a volume, V, measured at r.t.p. The gases react until there is no further change. …
- Question 10
A chemist prepares calcium nitrate. They start with 8.00 g of pure calcium oxide and an excess of dilute nitric acid. They produce 12.65 g of pure, dry anhydrous calcium nitrate crystals. What is the percentage yield of calcium nitrate? …
- Question 11
The apparatus shown is used to investigate the electrolysis using inert electrodes of dilute sulfuric acid and concentrated aqueous sodium chloride in separate experiments. test-tube X positive electrode negative electrode test-tube Y Which row shows the ratio of volume of …
- Question 12
Which statement about reactions is correct? A A reaction in which the number of bonds broken equals the number of bonds formed always has an enthalpy change, …
- Question 13
The word equations for two reactions of ethene are shown. reaction 1 ethene + hydrogen ethane reaction 2 ethene + bromine 1,2-dibromoethane The bond energies of the bonds involved in the reactions are shown in the table. bond …
- Question 14
Two changes are described. change 1 Copper is added to concentrated nitric acid. Nitrogen dioxide is produced. change 2 Concentrated sulfuric acid is added to sugar. The change that occurs cannot be reversed. Which row is correct? change 1 change …
- Question 15
Which change increases the rate of a chemical reaction? A using a higher pressure in a gaseous reaction B using a lower temperature C using a more dilute solution D using larger pieces of a solid
- Question 16
In two separate experiments, 1 and 2, an excess of powdered calcium carbonate reacts in a flask with dilute hydrochloric acid. In experiment 1, the volume of carbon dioxide evolved is measured at regular time intervals. In experiment 2, the …
- Question 17
Which statements about the Haber process for the manufacture of ammonia are correct? 1 At equilibrium, the concentrations of the reactants and products are no longer changing. 2 Increasing the pressure moves the position of equilibrium to the right. 3 …
- Question 18
Acidified aqueous potassium manganate(VII) is used as a test reagent. When it is added to an aqueous solution of compound M, the colour of the test reagent changes from 1 . This colour change shows that M is 2 . …
- Question 19
In a neutralisation reaction, which change in particles occurs? A atoms molecules B ions molecules C atoms ions D ions atoms
- Question 20
Which pair of substances are both insoluble in water? A ammonium chloride and ammonium carbonate B copper carbonate and copper hydroxide C lead nitrate and lead chloride D zinc sulfate and zinc hydroxide
- Question 21
The atomic number of element X is 12. What is the formula of the chloride of X? A XCl B XCl 2 C XCl 4 D X2Cl
- Question 22
Elements P, Q, R and S are in either Group I or Group VII of the Periodic Table. P is a liquid at r.t.p. Q is a gas at r.t.p. Elements R and S both form basic oxides. Element R …
- Question 23
Three statements about noble gases are listed. 1 Their atoms all have eight electrons in the outer shell. 2 They are unreactive because their outer shells are full. 3 They are diatomic. Which statements are correct? …
- Question 24
Solid 1 and solid 2 are both elements. Solid 1 is not malleable. Solid 2 is ductile. Which statement is correct? A Solid 1 has good electrical conductivity only when molten. B Solid 2 has good electrical conductivity only when …
- Question 25
When a piece of aluminium is placed in cold, dilute hydrochloric acid, no reaction is observed initially. What is the reason for this? A Aluminium contains small amounts of a more reactive metal that reacts with the acid instead. B …
- Question 26
A piece of zinc is attached to a steel car to prevent it from rusting. Which statement is correct? A A piece of copper is more effective than zinc because copper does not rust. B A piece of magnesium is …
- Question 27
Which statement about the extraction of iron from hematite in the blast furnace is correct? A Coke is reduced to carbon dioxide producing thermal energy to heat the furnace. B Hematite contains iron(III) oxide which is reduced by carbon monoxide. …
- Question 28
Water may contain many substances before it is purified for drinking. Three substances are listed. 1 dissolved oxygen 2 harmful microbes 3 insoluble solids Which substances are removed by the treatment of the domestic water supply? A 1 and …
- Question 29
Dry air is a mixture of gases. 99% of the mixture is nitrogen and oxygen. What is in the highest abundance in the remaining 1%? A argon B chlorine C hydrogen D water vapour
- Question 30
Which statement about alkanes is correct? A Ethane reacts with chlorine in an addition reaction. B Propane has a higher boiling point than butane. C The molecule of the alkane that contains 99 carbon atoms has 200 hydrogen atoms. D …
- Question 31
Compound X is an alcohol containing only three carbon atoms. Compound Y is an alcohol containing only four carbon atoms. Both compounds have the general formula CnH2n+1OH. Which row shows the numbers of structural isomers of compounds X and Y …
- Question 32
Which two compounds react together to form CH3CH2COOCH3? A ethanoic acid and ethanol B methanoic acid and ethanol C methanoic acid and propanol D propanoic acid and methanol
- Question 33
Three statements about fuels are listed. 1 Fossil fuels include coal, natural gas and wood. 2 Petroleum is a mixture of hydrocarbons. 3 Naphtha is used as a chemical feedstock. Which statements are correct? …
- Question 34
Which statement about propene is correct? A Propene is a saturated hydrocarbon because it has a double carbon–carbon bond in its molecule. B Propene is the third member of the homologous series of alkenes. C Propene reacts with bromine in …
- Question 35
Copper(II) oxide reacts with dilute ethanoic acid. Which equation for this reaction is correct? A CuO + CH3COOH CH3COOCu …
- Question 36
The diagram shows the repeat unit of a polymer. …
- Question 37
Which piece of apparatus is used to measure the volume of acid required to neutralise 25.0 cm3 of alkali in a titration? A beaker B burette C measuring cylinder D volumetric pipette
- Question 38
A mixture contains two solids, X and Y, and no other substances. X and Y are both soluble in water. The student separates X and Y using two steps. step 1 The student stirs the mixture into a beaker of …
- Question 39
Solid J contains cations and chloride ions. The aqueous solution of J is colourless. Two separate samples of the solution are tested. Aqueous sodium hydroxide added to the first sample produces a white precipitate. Aqueous ammonia added to the second …
- Question 40
Solid Q reacts with dilute hydrochloric acid, producing a gas that turns limewater milky. Warming solid Q with aqueous sodium hydroxide produces a gas that turns damp red litmus paper blue. What is solid Q? A ammonium carbonate B ammonium …
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