Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/21 Oct/Nov 2025 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 1, 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
- 27
File names: 0620_w25_qp_21 · 0620_w25_ms_21
Grade thresholds for 0620/21 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 |
|---|---|---|---|---|---|---|
| 27 | 23 | 20 | 18 | 15 | 13 | 11 |
Topics in this paper
Which syllabus chapters 0620/21 Oct/Nov 2025 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/21 Oct/Nov 2025
- Question 1
A sealed balloon contains air. The temperature of the balloon is increased. Which row describes how the pressure in the balloon and the kinetic energy of the particles in air change? pressure kinetic energy of particles A decreases decreases B …
- Question 2
Ammonia gas is reacted with hydrogen chloride gas using the apparatus shown. Solid ammonium chloride is produced. cotton wool soaked in aqueous ammonia cotton wool soaked in aqueous hydrogen chloride long glass tube solid ammonium chloride Which statement explains why …
- Question 3
The table shows information about four different particles. particle nucleon number number of protons number of neutrons number of electrons Na …
- Question 4
Substances with giant covalent structures can be used as lubricants and as cutting tools for hard materials. The diagrams show how the atoms are arranged in two giant covalent substances, P and …
- Question 5
Symbols representing four particles are shown. …
- Question 6
Which statement describes the formation of bonds in lithium bromide? A A lithium atom donates one electron to a bromine atom. B A bromine atom donates one electron to a lithium atom. C A lithium atom shares a pair of …
- Question 7
Which statement explains why solid magnesium is a good conductor of electricity? A Magnesium has delocalised electrons that can move through the lattice. B Magnesium has strong attractions between ions. C Magnesium consists of a giant lattice of anions in …
- Question 8
The equation for the reaction between dilute ethanoic acid and aqueous lithium hydroxide is shown. CH3COOH + LiOH CH3COOLi + H2O In an experiment, 20.0 cm3 of 0.050 mol / dm3 aqueous lithium hydroxide is exactly neutralised by 12.5 …
- Question 9
The molecular formulae of four compounds are listed. 1 CH4 …
- Question 10
The equation for the reaction between copper(II) oxide, CuO, and ammonia is given. 3CuO + 2NH3 3Cu …
- Question 11
How many atoms are present in 1.00 mol of argon? …
- Question 12
Aqueous copper(II) sulfate is electrolysed using copper electrodes. Which statement is correct? A Oxygen gas is produced at the positive electrode. B The blue colour of the solution gradually fades. C The concentration of copper ions in the solution stays …
- Question 13
Which row describes the reactions during the electrolysis of dilute aqueous sodium chloride? anode reaction cathode reaction …
- Question 14
Information about two reactions is given. ● The neutralisation reaction between citric acid and sodium hydrogencarbonate is endothermic. ● The displacement reaction between magnesium and carbon dioxide is exothermic. Which statements about the two reactions are correct? 1 The energy …
- Question 15
The reaction pathway diagram for a reaction is shown. …
- Question 16
Hydrogen peroxide solution decomposes very slowly at room temperature to produce oxygen gas. This gas forms a rising foam when liquid detergent is added. Five test-tubes are half-filled with hydrogen peroxide solution. A drop of liquid detergent is added to …
- Question 17
Which equation represents one of the reactions in the Contact process? A 2SO2(g) + O2(g) 2SO3(g) B 2SO2(g) + O2(g) 2SO3(aq) C 2SO3(g) + O2(g) 2SO4(aq) D 2SO3(g) + O2(g) 2SO4(g)
- Question 18
The ionic equation for the redox reaction between acidified manganate(VII) ions and iodide ions is shown. 2MnO4 –(aq) + 16H+(aq) + 10I–(aq) 2Mn2+(aq) + 5I2(aq) + 8H2O(l) Which row shows the changes in oxidation number for manganese and for …
- Question 19
In the Haber process, nitrogen and hydrogen react to form ammonia. …
- Question 20
Which statement describes a property of ethanoic acid? A It does not produce carbon dioxide when added to sodium carbonate. B It does not produce hydrogen when added to magnesium. C It only donates some of its protons when added …
- Question 21
A student adds different solid salts to an excess of water. The student stirs the mixtures to determine the solubilities of the salts. The results are shown. …
- Question 22
Four metal oxides are listed. 1 Al 2O3 2 CaO 3 CuO 4 ZnO Which metal oxides are amphoteric? A 1 and …
- Question 23
The ions formed when element X and element Y react together are shown. ● Element X forms X– ions. ● Element Y forms Y2+ ions. Which row identifies the position of X and of Y in the Periodic Table? …
- Question 24
Which properties decrease down the group of alkali metals? 1 melting point 2 density 3 reactivity A 1 and …
- Question 25
Some halide ions are displaced from aqueous potassium halides by halogens. In which mixtures are the halide ions displaced? 1 potassium bromide and chlorine 2 potassium bromide and iodine 3 potassium iodide and chlorine 4 potassium chloride and iodine A …
- Question 26
What is the correct order of reactivity of the following metals, from least reactive to most reactive? A calcium magnesium zinc copper B copper zinc magnesium calcium C copper zinc calcium …
- Question 27
The equation for the reaction between aluminium and iron(III) oxide is shown. 2Al + Fe2O3 Al 2O3 + 2Fe Which statement about this reaction is correct? A The aluminium acts as an oxidising agent. B It shows that iron …
- Question 28
Which row identifies methods used to prevent iron from rusting? greasing painting washing with distilled water …
- Question 29
Which statement about the extraction of aluminium by electrolysis is correct? A Aluminium oxide is dissolved in molten cryolite to increase its melting point. B At the cathode, oxygen ions lose electrons to form oxygen gas. C The carbon in …
- Question 30
Catalytic converters are used to remove oxides of nitrogen from exhaust gases. The equation represents one of the reactions that occur in a catalytic converter. 2NO + 2CO …
- Question 31
Some gases are present in clean, dry air, while other gases are only present in polluted air. Which row is correct? a gas present in clean, dry air a gas only present in polluted air A argon carbon dioxide B …
- Question 32
Petroleum is separated by fractional distillation. Which statement about the fractions produced is correct? A Bottled gas for heating and cooking is obtained from the naphtha fraction. B Diesel oil is used as a fuel for jet aircraft. C Substances …
- Question 33
Which structure represents a compound in the alcohol homologous series? …
- Question 34
Ethane reacts with chlorine. Which row identifies the type of reaction and the formulae of the products formed? reaction products A addition CH3CH2Cl …
- Question 35
Which equation represents the formation of poly(propene) from propene? …
- Question 36
Ethene reacts with hydrogen in an addition reaction to form ethane. Which catalyst is used for this reaction? A iron B nickel C vanadium(V) oxide D yeast
- Question 37
What is produced by the bacterial oxidation of ethanol? A ethene B sodium ethanoate C ethyl ethanoate D vinegar
- Question 38
Which statement about addition polymers or condensation polymers is correct? A Addition polymers only contain carbon and hydrogen atoms. B One of the monomers used to make a polyester is a diamine. C Addition polymers contain carbon–carbon double bonds in …
- Question 39
The results of flame tests on three metal salts, X, Y and Z, are shown. metal salt flame test colour X yellow Y lilac Z blue-green Which row identifies the cations present in X, Y and …
- Question 40
Ethanol can be made by fermentation of sugar, using yeast. This produces a mixture of ethanol and water. How is ethanol separated from this mixture? A distilling the mixture using a fractionating column B filtering the mixture C heating to …
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