Cambridge IGCSE · 0620 · Paper 2 · Multiple choice (Extended)
Chemistry 0620/21 Oct/Nov 2021 past paper
Cambridge IGCSE Chemistry (0620) Paper 2 (Multiple choice (Extended)), variant 1, Oct/Nov 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
- 23
File names: 0620_w21_qp_21 · 0620_w21_ms_21
Grade thresholds for 0620/21 Oct/Nov 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 |
|---|---|---|---|---|---|---|
| 23 | 20 | 16 | 15 | 13 | 12 | 11 |
Topics in this paper
Which syllabus chapters 0620/21 Oct/Nov 2021 tested, by marks. Each chapter links to every past-paper question on it.
Questions in 0620/21 Oct/Nov 2021
- Question 1
Decane has a freezing point of –30 °C and a boiling point of …
- Question 2
A student put exactly 25.00 cm3 of dilute hydrochloric acid into a conical flask. The student added 2.5 g of solid sodium carbonate and measured the change in temperature of the mixture. Which apparatus does the student need to use? …
- Question 3
A student separates sugar from pieces of broken glass by dissolving the sugar in water and filtering off the broken glass. filtrate What is the filtrate? A broken glass only B broken glass and sugar solution C pure water D …
- Question 4
Which statement explains why metals conduct electricity when solid? A They have atoms which are free to move. B They have electrons which are free to move. C They have molecules which are free to move. D They have positive …
- Question 5
Which description of brass is correct? A alloy B compound C element D non-metal
- Question 6
The equation for the reaction of iron(III) oxide with carbon monoxide is shown. Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) What is the maximum mass of iron that can be made from 480 g of iron(III) oxide? …
- Question 7
Which statement describes the attractive forces between molecules? A They are strong covalent bonds which hold molecules together. B They are strong ionic bonds which hold molecules together. C They are weak forces formed between covalently-bonded molecules. D They are …
- Question 8
Which statement about carbon is correct? A Diamond and graphite both have simple molecular structures. B Diamond and graphite are both used to make cutting tools. C Each carbon atom in diamond is bonded to three other carbon atoms. D …
- Question 9
The formula of an aluminium ion is Al 3+. What is the formula of aluminium sulfate? A Al 2SO4 B Al (SO4)2 C Al 2(SO4)3 D Al 3(SO4)2
- Question 10
Which statements about the products of electrolysis, using inert electrodes, are correct? 1 When molten lead(II) bromide is electrolysed, bromine is formed at the cathode. 2 When dilute sulfuric acid is electrolysed, oxygen is formed at the anode. 3 When …
- Question 11
Chlorine reacts with ethane to produce chloroethane and hydrogen chloride. …
- Question 12
Hydrogen is used as a fuel in rockets and is also used in hydrogen fuel cells. Which statements are correct? 1 Both uses produce water vapour. 2 Burning hydrogen produces polluting gases. 3 A fuel cell produces electricity. …
- Question 13
Which statements about the effect of increasing the temperature on the rate of a reaction are correct? 1 It increases the rate of a reaction. 2 It increases the activation energy. 3 It increases the frequency of collisions. …
- Question 14
Ammonia is made by reacting nitrogen with hydrogen. The equation for the reaction is shown. …
- Question 15
X is a pink solid. Y is a blue solid. When X is heated, water is produced and the solid turns blue. When water is added to Y, the solid turns pink. What are X and …
- Question 16
Iron(II) chloride solution reacts with chlorine gas. The equation is shown. 2FeCl 2(aq) + Cl 2(g) → 2FeCl 3(aq) Which statements about this reaction are correct? 1 Fe2+ ions are reduced to Fe3+ ions. 2 Chlorine acts as a reducing …
- Question 17
Which row describes the properties of an acid? property 1 property 2 A proton acceptor pH less than 7 B proton acceptor pH more than 7 C proton donor pH less than 7 D proton donor pH more than 7
- Question 18
Which element forms an amphoteric oxide? A aluminium B carbon C magnesium D silicon
- Question 19
Copper(II) chloride crystals are made by adding solid copper(II) carbonate to dilute hydrochloric acid until no more dissolves. Which process is used to obtain pure copper(II) chloride crystals from the mixture? A distillation of the mixture B evaporation of the …
- Question 20
Moving from right to left across the Periodic Table the elements show increasing metallic character. Why does metallic character increase from right to left across a period? A The atoms have more electrons in their outer shells. B The atoms …
- Question 21
A period of the Periodic Table is shown. group I II III IV V VI VII VIII element …
- Question 22
Group VII elements show trends in their physical properties going down the group. element …
- Question 23
Some properties of two metals, G and H, are shown. metal G metal H the formula of the chloride is GCl high melting point reacts with cold water has more than one oxidation state Which row about metals G and …
- Question 24
The noble gases are in Group VIII of the Periodic Table. Which statement explains why noble gases are unreactive? A They all have eight electrons in their outer shells. B They all have full outer shells. C They are all …
- Question 25
Which statement is correct for all metals? A They conduct electricity when molten. B They gain electrons when they form ions. C They have a low density. D They have a low melting point.
- Question 26
Which statement about the extraction of metals is correct? A Aluminium is extracted from the ore bauxite by electrolysis. B Aluminium is extracted from the ore hematite by electrolysis. C Iron is extracted from the ore bauxite by electrolysis. D …
- Question 27
Aluminium objects do not need protection from corrosion. Iron objects must be protected from corrosion. Which statement explains why aluminium resists corrosion? A Aluminium does not form ions easily. B Aluminium does not react with water or air. C Aluminium …
- Question 28
Which statements about the thermal decomposition of copper(II) nitrate are correct? 1 A brown gas is given off. 2 A gas which relights a glowing splint is given off. 3 The solid residue is an acidic oxide. A 1 only …
- Question 29
Covering iron with zinc prevents the iron from rusting even when the zinc is scratched. Covering iron with tin prevents the iron from rusting, but when the tin is scratched the iron underneath starts to rust. Which statement is correct? …
- Question 30
Which statements about the Haber process are correct? 1 One of the raw materials is extracted from liquid air by fractional distillation. 2 One of the raw materials is produced by the reaction of steam and methane. 3 The catalyst …
- Question 31
Which raw material is used in the Contact process? A air B ammonia C carbon D nitrogen
- Question 32
Lime (calcium oxide) is used to treat waste water from a factory. Which substance is removed by the lime? A ammonia B sodium chloride C sodium hydroxide D sulfuric acid
- Question 33
An alkane molecule of molecular formula C8H18 undergoes cracking. The equation for the reaction is shown. …
- Question 34
Fuel X produces carbon dioxide and water when it is burned in air. So does fuel Y. What could X and Y be? …
- Question 35
Which molecule contains only single covalent bonds? A propane B propanoic acid C propene D propyl propanoate
- Question 36
Alkanes react with chlorine to form chloroalkanes. Which statement about the reactions of alkanes with chlorine is correct? A Alkanes react with chlorine by addition. B The gaseous product turns red litmus blue. C The chlorine atom in chloroethane is …
- Question 37
Part of the structure of a very large molecule is shown. …
- Question 38
Propene reacts with steam to form propanol. …
- Question 39
Which statement about aqueous ethanoic acid is correct? A It reacts with magnesium to produce a salt and hydrogen. B It reacts with sodium hydroxide to produce a salt and hydrogen. C It reacts with ammonium salts to produce ammonia. …
- Question 40
The diagram shows the partial structure of Terylene. …
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