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Learn Extracted exam questions IGCSE Chemistry 0620 Chemistry November 2025 Question Paper 23

0620 Chemistry November 2025 Question Paper 23

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1 1 mark multiple_choice 1.1

What happens to the volume of a fixed mass of gas when pressure and temperature are separately increased? volume of gas pressure increased temperature increased

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
2 1 mark multiple_choice 1.2

Which gas diffuses most quickly at room temperature and pressure?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
3 1 mark multiple_choice 2.2

Which statement defines nucleon number?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
4 1 mark multiple_choice 2.2

The symbols of four atoms are listed.

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
5 1 mark multiple_choice 2.4

Which statement describes all positive ions?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
6 1 mark multiple_choice 2.3

A sample of copper has a relative atomic mass of 63.5. What are the relative abundances of the isotopes in this sample of copper?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
7 1 mark multiple_choice 2.5

Which diagram shows the outer shell electron arrangement for a molecule of methanol, CH3OH?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
8 1 mark multiple_choice 2.6

Rescuers are drilling through fallen rock in order to rescue some people trapped in a cave. The drill needs lubricating from time to time. Four statements are made about the materials used for the drill tip and the lubricant to explain the reasons for their use. Diamond is used for the drill tip as it does not conduct electricity. Diamond is used for the drill tip as it is very hard. Graphite is used as the lubricant as it conducts electricity. Graphite is used as the lubricant as it is soft and slippery. Which statements are correct?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
9 1 mark multiple_choice 3.1

Which compound has an empirical formula that is the same as its molecular formula?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
10 1 mark multiple_choice 3.1

Which row identifies the charge on the chromium ion and on the sulfate ion in Cr2(SO4)3? Cr SO4

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
11 1 mark multiple_choice 7.3

Which statement describes a saturated solution?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
12 1 mark multiple_choice 3.3

Calcium carbonate decomposes when heated strongly. CaCO3(s)  CaO(s) + CO2(g) How many gaseous molecules are produced when 10.0 g of calcium carbonate is completely decomposed?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
13 1 mark multiple_choice 4.1

Which product is initially obtained at each electrode during the electrolysis of concentrated aqueous sodium chloride? cathode anode

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
14 1 mark multiple_choice 4.1

Molten lead(II) bromide is electrolysed using inert electrodes. + – X Y power supply Which statement describes the movement of electrons?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
15 1 mark multiple_choice 4.2

In a fuel cell, a fuel is oxidised to produce electricity. Which row describes the fuel and the oxidising agent used? fuel oxidising agent

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
16 1 mark multiple_choice 6.1

Which statement about reactions is correct?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
17 1 mark multiple_choice 11.5

Ethene reacts with hydrogen to form ethane.

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
18 1 mark multiple_choice 6.4

Zinc reacts with dilute hydrochloric acid. Which statement about the particles in the reaction is correct?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
19 1 mark multiple_choice 6.3

Ethanol is manufactured by the addition of steam to ethene. C2H4(g) + H2O(g) C2H5OH(g) The reaction conditions are 300 °C and 60 atm. The forward reaction is exothermic. Which rows describe the effect on the equilibrium yield of C2H5OH when the stated change is made? change equilibrium yield of C2H5OH adding a catalyst no change decreasing the temperature increases decreasing the pressure increases

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
20 1 mark multiple_choice 6.3

Which row identifies the conditions used to make sulfur trioxide in the Contact process? pressure / kPa catalyst

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
21 1 mark multiple_choice 7.1

Which statement describes a base?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
22 1 mark multiple_choice 6.4

The equation shows the reaction between copper and concentrated nitric acid. Cu(s) + 4HNO3(aq)  Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) Which element is reduced in this reaction?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
23 1 mark multiple_choice 8.1

The Periodic Table shows the position of four different elements.

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
24 1 mark multiple_choice 7.1

Dilute acid R and dilute acid S have the same concentration. The same volume of each dilute acid is reacted separately with the same mass of magnesium ribbon. Both reactions are carried out at room temperature and pressure. The volume of hydrogen produced is measured. A graph of the results is shown. total volume of hydrogen time R S Which statement about the reactions is correct?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
25 1 mark multiple_choice 7.2

Which metal oxide reacts with aqueous sodium hydroxide to form a salt and water?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
26 1 mark multiple_choice 8.4

Which row identifies a transition element? melting point density at r.t.p.

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
27 1 mark multiple_choice 8.2

Which statement about Group I or Group VII elements is correct?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
28 1 mark multiple_choice 9.4

Some information about four metals P, Q, R and S is listed. Metal P does not react with dilute hydrochloric acid. Metal Q is more reactive than magnesium. Metal R reacts rapidly with cold water to produce hydrogen. Metal S reacts with dilute hydrochloric acid to produce hydrogen. Which row identifies P, Q, R and S? P Q R S

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
29 1 mark multiple_choice 10.3

Cars are fitted with catalytic converters. Which equation represents a reaction that takes place in a catalytic converter?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
30 1 mark multiple_choice 10.3

Three statements about greenhouse gases and global warming are listed. A greenhouse gas molecule can absorb and emit thermal energy. The Earth is a source of thermal energy. Thermal energy emitted by a greenhouse gas molecule is sent out in all directions. Which statements are correct?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
31 1 mark multiple_choice 11.4

Which type of reaction takes place when methane reacts with chlorine in the presence of ultraviolet light?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
32 1 mark multiple_choice 9.6

Iron is extracted from iron(III) oxide in the blast furnace. Three steps in the process are listed. Carbon (coke) is completely oxidised. Iron(III) oxide is reduced. Carbon dioxide is reduced to carbon monoxide. What is the correct order of the steps in the extraction of iron?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
33 1 mark multiple_choice 9.6

Three different reactions that occur during the extraction of aluminium from purified bauxite are listed. Al 3+ + 3e–  Al C + O2  CO2 2O2–  O2 + 4e– Which reactions occur at the anode?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
34 1 mark multiple_choice 7.1

Which statement about aqueous ethanoic acid is correct?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
35 1 mark multiple_choice 11.8

The diagrams represent four monomers. H2N NH2 HOOC NH2 HO NH2 HO OH The monomers each react in a 1 : 1 ratio with the dicarboxylic acid shown. HOOC COOH How many of the four monomers shown can react with the dicarboxylic acid to form a polymer?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
36 1 mark multiple_choice 11.5

Propene undergoes addition reactions with bromine, hydrogen and steam. Which structures represent a product of these reactions? H

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
37 1 mark multiple_choice 11.1

The structures of four compounds are shown.

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
38 1 mark multiple_choice 11.7

Which statement about ethanoic acid is correct?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
39 1 mark multiple_choice 12.5

Substance X contains one cation. Two tests are completed on aqueous X. test 1 flame test test 2 addition of aqueous sodium hydroxide dropwise and then in excess Which row shows a possible combination of observations for the tests? observation for test 1 observation for test 2

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D
40 1 mark multiple_choice 12.3

A colourless mixture is separated by paper chromatography. The steps below describe the method. These steps are not in the correct order. Remove the chromatography paper from the solvent when the solvent front is near the top of the paper. Place the chromatography paper in the solvent. Spray the chromatography paper with a locating agent. Place a spot of the mixture on the pencil line. Draw a pencil line at the bottom of the chromatography paper. Draw a pencil line to mark the position of the solvent front. What is the correct order for these steps?

  1. A

    A
  2. B

    B
  3. C

    C
  4. D

    D

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