Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/23 May/June 2021 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 3, May/June 2021: 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_s21_qp_23 · 0620_s21_ms_23
Grade thresholds for 0620/23 May/June 2021
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 | 21 | 16 | 15 | 14 | 13 | 12 |
Topics in this paper
Which syllabus chapters 0620/23 May/June 2021 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/23 May/June 2021
- Question 1
A gas is released at point P in the apparatus shown. P damp universal indicator paper Which gas turns the damp universal indicator paper red most quickly? A ammonia, NH3 B chlorine, Cl 2 C hydrogen chloride, HCl D sulfur …
- Question 2
A 1 cm3 sample of substance X is taken. This is sample 1. X is then converted to a different physical state and a 1 cm3 sample is taken. This is sample 2. Sample 2 contains more particles in the …
- Question 3
Which statement about paper chromatography is correct? A A solvent is needed to dissolve the paper. B Paper chromatography separates mixtures of solvents. C The solvent should cover the baseline. D The baseline should be drawn in pencil.
- Question 4
Element X has 7 protons. Element Y has 8 more protons than X. Which statement about element Y is correct? A Y has more electron shells than …
- Question 5
A covalent molecule Q contains only six shared electrons. What is Q? A ammonia, NH3 B chlorine, Cl 2 C methane, CH4 D water, H2O
- Question 6
Which statement explains why metals are malleable? A The atoms release electrons to become cations. B The electrons are free to move. C The electrons and the cations are attracted to each other. D The layers of ions can slide …
- Question 7
Which statement about isotopes of the same element is correct? A They have different numbers of electrons. B They have different numbers of neutrons. C They have different numbers of protons. D They have the same mass number.
- Question 8
The element silicon has the same structure as diamond. Which statement about silicon is correct? A Every silicon atom is bonded to three other atoms only. B Silicon has a high melting point. C Silicon is a good conductor of …
- Question 9
Three ionic compounds of vanadium have the formulae V2O, VCl 2 and V2O3. What is the charge on the vanadium ion in each compound? V2O VCl …
- Question 10
In separate experiments, electricity was passed through concentrated aqueous sodium chloride and molten lead(II) bromide. What would happen in both experiments? A A halogen would be formed at the anode. B A metal would be formed at the cathode. C …
- Question 11
The equation for the decomposition of calcium carbonate is shown. CaCO3 CaO + CO2 What mass of calcium oxide is produced when 10 g of calcium carbonate is heated? …
- Question 12
Gas syringe X contains 100 cm3 of hydrogen bromide gas, HBr. Gas syringe Y contains 100 cm3 of carbon dioxide gas. The volume of each gas is measured at room temperature and pressure. Which statement is correct? A The mass …
- Question 13
Which simple cell produces the most electrical energy? V A magnesium zinc …
- Question 14
When sulfur is heated it undergoes a 1 change as it melts. Further heating causes the sulfur to undergo a 2 change and form sulfur dioxide. Which words complete gaps 1 and …
- Question 15
Four statements about the effect of increasing temperature on a reaction are shown. 1 The activation energy becomes lower. 2 The particles move faster. 3 There are more collisions between reacting particles per second. 4 There are more collisions which …
- Question 16
An example of a redox reaction is shown. Zn + Cu2+ Zn2+ + Cu Which statement about the reaction is correct? A Zn is the oxidising agent and it oxidises Cu2+. B Zn is the oxidising agent and it …
- Question 17
The equation for the decomposition of hydrogen iodide is shown. 2HI …
- Question 18
Element X forms an oxide, XO, that neutralises sulfuric acid. Which row describes X and XO? element X nature of oxide, XO A metal acidic B metal basic C non-metal acidic D non-metal basic
- Question 19
Aqueous solutions of sodium sulfate and barium chloride are mixed. Na2SO4(aq) + BaCl 2(aq) BaSO4(s) + 2NaCl (aq) Which process is used to separate a sample of barium sulfate from the reaction mixture? A precipitation B filtration C evaporation …
- Question 20
Information about element J is shown. ● Its atoms have four electrons in their outer shell. ● It is a non-metal. ● Its oxide has a macromolecular structure. ● It has a high melting point. What is J? A beryllium …
- Question 21
Which property is shown by transition elements? A low density B low melting point C variable oxidation state D white compounds
- Question 22
Helium and neon exist as monoatomic gases at room temperature and pressure. statement 1 Helium and neon have eight electrons in their outer shell. statement 2 Helium and neon are unreactive. Which option is correct? A Statement 1 and statement …
- Question 23
What are possible effects of an inadequate water supply during a drought? 1 crop failure 2 wastage of water 3 human disease 4 death of farm animals …
- Question 24
Which statement explains why galvanising prevents iron from rusting? A Zinc is more reactive than iron and corrodes in preference to iron. B Zinc is more reactive than iron and loses electrons less easily than iron. C Zinc is less …
- Question 25
Some metal nitrates and carbonates decompose when heated strongly. Metal Q has a nitrate that decomposes to give a salt and a colourless gas only. The carbonate of metal Q does not decompose when heated with a Bunsen burner. What …
- Question 26
Which compounds are released by the extraction of zinc from zinc blende and by respiration? extraction of zinc respiration A CO2 and SO2 CO2 only B CO2 and SO2 CO2 and H2O C CO2 only CO2 only D CO2 only …
- Question 27
Which gas is an air pollutant that causes acid rain? A argon B carbon monoxide C methane D nitrogen dioxide
- Question 28
Ammonia is made from nitrogen and hydrogen. The equation for the reaction is shown. …
- Question 29
Which reaction does not occur during the extraction of iron from hematite in a blast furnace? …
- Question 30
Which substance is used as a catalyst in the manufacture of sulfuric acid by the Contact process? A iron B nickel C phosphoric acid D vanadium(V) oxide
- Question 31
Metal X is a good conductor of electricity and is used for electrical wiring. Metal Y is used to make an alloy which is resistant to corrosion and is used to make cutlery. Metal Z is light and strong and …
- Question 32
The formulae of two compounds of manganese are MnO2 and KMnO4. In these two compounds the oxidation state of potassium is +1 and the oxidation state of oxygen is –2. What are the oxidation states of manganese in each of …
- Question 33
Which statement about calcium carbonate is correct? A It is made by the thermal decomposition of limestone. B It is used to neutralise alkaline soils. C It is a reactant in the test for carbon dioxide. D It is used …
- Question 34
Ethanol is reacted with acidified potassium manganate(VII). Which row describes the type of reaction and the type of organic compound formed? type of reaction organic compound A oxidation carboxylic acid B oxidation alkene C dehydration carboxylic acid D dehydration alkene
- Question 35
The diagrams show the structural formulae of four compounds. …
- Question 36
Which statement about alkanes is correct? A They burn in oxygen. B They contain carbon, hydrogen and oxygen atoms. C They contain double bonds. D They contain ionic bonds.
- Question 37
How much hydrogen is needed to react completely with 0.02 moles of butene to make butane? A 0.24 dm3 B 0.48 dm3 C 0.96 dm3 D 1.20 dm3
- Question 38
What is an advantage of the fermentation process for producing ethanol compared with the catalytic addition of steam to ethene? A Fermentation requires less heat energy. B Ethanol from fermentation needs to be distilled. C Raw materials for fermentation are …
- Question 39
The structure of a synthetic polymer is shown. …
- Question 40
Which substance is a natural polymer? A ethene B Terylene C nylon D protein Group The Periodic Table of Elements 1 H hydrogen 1 2 He helium 4 I II III IV V VI VII VIII 3 Li lithium 7 …
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