Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/21 May/June 2025 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 1, 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
- 28
File names: 0620_s25_qp_21 · 0620_s25_ms_21
Grade thresholds for 0620/21 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 |
|---|---|---|---|---|---|---|
| 28 | 23 | 19 | 17 | 15 | 13 | 11 |
Topics in this paper
Which syllabus chapters 0620/21 May/June 2025 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/21 May/June 2025
- Question 1
A gas is placed in a sealed container with a fixed volume. The gas is heated. Which statements are correct? 1 The gas molecules move around faster. 2 The gas particles collide with the walls of the container more frequently. …
- Question 2
A sample of ethanol is heated at a constant rate. The heating curve for this sample is shown. temperature time …
- Question 3
Which atom has an equal number of protons, neutrons and electrons? A 40Ar …
- Question 4
The only naturally occurring isotopes in a sample of europium are 151Eu and 153Eu. This sample of europium has a relative atomic mass, Ar, of 152. What is the percentage of 151Eu present in this sample to three significant figures? …
- Question 5
Which statement about potassium chloride is correct? A It has a high melting point because it is a giant structure with strong covalent bonds. B It conducts electricity when solid because of its oppositely charged ions. C It conducts electricity …
- Question 6
Which dot-and-cross diagram shows the outer shell electron arrangement in a molecule of nitrogen? …
- Question 7
Which statement about silicon(IV) oxide is correct? A It contains silicon ions and oxide ions arranged in a giant lattice. B It is used in electrical circuits because it can conduct electricity. C Its bonds each contain one shared pair …
- Question 8
Three organic molecules are described. ● The molecular formula of propanoic acid is CH3CH2COOH. ● The molecular formula of lactic acid is CH3CH(OH)COOH. ● A glucose molecule consists of 6 carbon atoms, 6 oxygen atoms and 12 hydrogen atoms only. …
- Question 9
Calcium carbonate reacts with dilute hydrochloric acid. The equation for the reaction is shown. CaCO3 + 2HCl CaCl …
- Question 10
The diagram shows the electroplating of a steel object. steel object copper electrode aqueous copper(II) sulfate + – power supply A student makes three statements. 1 The steel object turns a reddish-brown colour. 2 The aqueous copper(II) sulfate changes to …
- Question 11
Concentrated aqueous sodium chloride is electrolysed using inert electrodes. Which equation shows the correct ionic half-equation for the reaction at the anode? A Cl …
- Question 12
Which equation represents the overall reaction in a hydrogen–oxygen fuel cell? …
- Question 13
Water is added to anhydrous copper(II) sulfate in a test-tube. The mixture becomes hot. Which type of reaction and reaction pathway diagram apply to this reaction? type of reaction reaction pathway diagram A endothermic energy progress of reaction reactants products …
- Question 14
The equation represents the reaction between ethanoic acid and ethanol. CH3COOH + CH3CH2OH CH3COOCH2CH3 + H2O Which type of reaction does this show? A addition B neutralisation C reduction D reversible
- Question 15
The graph shows the results of adding excess calcium carbonate to hydrochloric acid at 50 °C and at 30 °C. Only the temperature is changed. total volume of carbon dioxide given off / cm3 time …
- Question 16
Industrially, ammonia is made by the Haber process. The equation is shown. …
- Question 17
Ethanol is warmed with acidified aqueous potassium manganate(VII). Which row describes the type of reaction of the ethanol and the colour change observed in the reaction mixture? type of reaction colour change A oxidation colourless to purple B oxidation purple …
- Question 18
Two experiments involving acids R or S are done. ● 0.10 mol of acid R completely dissolves in 500 cm3 of water. 0.0048 mol of acid R is dissociated in the solution. ● 0.10 mol of acid S completely dissolves …
- Question 19
Lead(II) sulfate is an insoluble salt. Which process is not used to prepare a pure sample of this salt? A crystallisation B drying C filtration D precipitation
- Question 20
The formulae of two hydrated salts are shown. ● CuSO4•xH2O ● CoCl 2•yH2O What are the values of x and …
- Question 21
The properties of the elements change from left to right across the Periodic Table. Which statement describes how the properties change across Period 3? A Elements change from gases to solids. B Elements change from non-conductors to electrical conductors. C …
- Question 22
Which property decreases down Group VII of the Periodic Table, from chlorine to iodine? A atomic number B density C reactivity D melting point
- Question 23
Some properties of elements are listed. 1 They have good electrical conductivity. 2 They have high melting points. 3 They are malleable. 4 They have ions with variable oxidation numbers. Which properties are correct for both iron and lithium? A …
- Question 24
Two statements about noble gases are listed. 1 Noble gases are reactive, monatomic gases. 2 Noble gases all have a full outer shell of electrons. Which statements about noble gases are correct? A Both statements are correct, and statement 2 …
- Question 25
Which statement about the properties and uses of copper is correct? A It is used in electrical wiring, and it is ductile. B It is mixed with tin to make the alloy brass. C It is used in overhead electrical …
- Question 26
Three statements about solid Z are listed. ● It reacts with dilute hydrochloric acid to produce hydrogen. ● It reacts very slowly with cold water and quickly with steam. ● It is a good thermal conductor. What is solid Z? …
- Question 27
Four metals J, K, L and M are added separately to aqueous solutions of their ions. The results are shown. aqueous ions metal …
- Question 28
Which process is used in the extraction of iron from hematite? A electrolysis B precipitation C reduction D fractional distillation
- Question 29
Galvanising prevents iron from rusting. Which statements about galvanising are correct? 1 Galvanising involves coating the iron with silver. 2 Galvanising prevents oxygen and water from coming into contact with the iron. 3 Galvanising works because the metal coating loses …
- Question 30
Nitrogen, phosphorus and potassium are essential elements for improved plant growth. Which mixture provides all three essential elements? mixture formulae A ammonium phosphate + potassium chloride (NH4)3PO4 + KCl B ammonium phosphate + ammonium nitrate (NH4)3PO4 + NH4NO3 C ammonium …
- Question 31
Which statements help explain why an increasing amount of carbon dioxide or methane in the atmosphere causes global warming? 1 Carbon dioxide absorbs thermal energy from the Earth. 2 Methane does not absorb thermal energy from the Sun. 3 Carbon …
- Question 32
The exhaust gases from cars contain oxides of nitrogen. How are these oxides of nitrogen formed? A Nitrogen and oxygen from the air react together at the high temperatures in the engine. B Nitrogen and oxygen from the petrol react …
- Question 33
The structural formula of methyl ethanoate is CH3COOCH3. Which compounds are structural isomers of methyl ethanoate? 1 HCOOCH2CH3 2 CH3CH2COOH 3 HOCH2CH2CH2OH …
- Question 34
What is the total number of covalent bonds in one molecule of propane? …
- Question 35
Industrially, ethanol is produced by fermentation or by the reaction of ethene with steam. Which row is correct? fermentation ethene + steam A uses a temperature of 100 °C uses a temperature of …
- Question 36
Some properties of an organic compound, J, are listed. ● It is a liquid at room temperature. ● It is soluble in water. ● A solution of J reacts with calcium carbonate to form carbon dioxide. ● A solution of …
- Question 37
The structures of two monomers that are used to make a condensation polymer are shown. HO …
- Question 38
Which item of apparatus is used to measure 25.0 cm3 of aqueous sodium hydroxide? …
- Question 39
Which method is used to obtain copper(II) sulfate crystals from an aqueous solution of copper(II) sulfate? A chromatography B condensation C evaporation D filtration
- Question 40
A mixture of four different colourless amino acids is analysed by paper chromatography. The final chromatogram is shown. solvent front baseline Why does the chromatogram only show three spots? A A locating agent is not used. B One of the …
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