Group 7(17), the halogens: AQA A‑Level Chemistry questions

Every AQA A-Level Chemistry exam question on 3.2.3 Group 7(17), the halogens, 2016–2025, with its mark scheme and examiner’s report.

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2,301 questions

Q01.5
June 2025 · Paper 1
3 marks3.2.3 Group 7(17), the halogens
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Q05.4
June 2025 · Paper 1
4 marks3.2.3 Group 7(17), the halogens
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Q02.1
June 2025 · AS Paper 1
2 marks3.2.3 Group 7(17), the halogens
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Q02.2
June 2025 · AS Paper 1
2 marks3.2.3 Group 7(17), the halogens
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Q02.3
June 2025 · AS Paper 1
1 mark3.2.3 Group 7(17), the halogens
Mark scheme (PDF)
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Q02.4
June 2025 · AS Paper 1
1 mark3.2.3 Group 7(17), the halogens
Mark scheme (PDF)
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Q02.7
June 2025 · AS Paper 1
2 marks3.2.3 Group 7(17), the halogens
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Q02.8
June 2025 · AS Paper 1
3 marks3.2.3 Group 7(17), the halogens
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Q06.2
June 2025 · AS Paper 1
1 mark3.2.3 Group 7(17), the halogens
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Q17
June 2025 · AS Paper 1
1 mark3.2.3 Group 7(17), the halogens
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Q05.1
June 2024 · Paper 1
1 mark3.2.3 Group 7(17), the halogens
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Q05.2
June 2024 · Paper 1
1 mark3.2.3 Group 7(17), the halogens
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Q05.4
June 2024 · Paper 1
2 marks3.2.3 Group 7(17), the halogens
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Q20
June 2024 · Paper 3
1 mark3.2.3 Group 7(17), the halogens
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Q21
June 2024 · Paper 3
1 mark3.2.3 Group 7(17), the halogens
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Q01.1
June 2024 · AS Paper 1
2 marks3.2.3 Group 7(17), the halogens
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Q01.2
June 2024 · AS Paper 1
2 marks3.2.3 Group 7(17), the halogens
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Q01.3
June 2024 · AS Paper 1
3 marks3.2.3 Group 7(17), the halogens
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Q04
June 2024 · AS Paper 1
6 marks3.2.3 Group 7(17), the halogens
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Q13
June 2024 · AS Paper 1
1 mark3.2.3 Group 7(17), the halogens
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All 84 questions on Group 7(17), the halogens, as a list

June 2025, Paper 1, Q01.5 (3 marks): Identify the anion in solution X. Give an ionic equation, including state symbols, for the reaction that occurs in Test 2. Explain why AgNO3(aq) is acidified. [
June 2025, Paper 1, Q05.4 (4 marks): Solid sodium bromide reacts with concentrated sulfuric acid. Two reactions occur • an acid-base reaction • a redox reaction. Give an equation and an observation
June 2025, AS Paper 1, Q02.1 (2 marks): Table 1 shows the boiling points of some halogens. Table 1 Halogen Boiling point / °C Fluorine –188 Chlorine –35 Bromine 59 Explain the trend in the boiling poi
June 2025, AS Paper 1, Q02.2 (2 marks): Chlorine is toxic but is added to drinking water. State why chlorine is added to drinking water. Explain why this is safe to do even though chlorine is toxic. [
June 2025, AS Paper 1, Q02.3 (1 mark): Give an equation for the reaction of chlorine with water in sunlight. [1 mark]
June 2025, AS Paper 1, Q02.4 (1 mark): Give the equation for the reaction between NaOH and Cl2 to form NaClO [1 mark]
June 2025, AS Paper 1, Q02.7 (2 marks): A halide ion X– reduces concentrated sulfuric acid to hydrogen sulfide. Identify the halide ion. Give an equation for the reaction. [2 marks] Halide ion Equatio
June 2025, AS Paper 1, Q02.8 (3 marks): Some solid sodium halides react with concentrated sulfuric acid without any redox reaction taking place. Identify a sodium halide that behaves in this way. Give
June 2025, AS Paper 1, Q06.2 (1 mark): Describe a test to confirm that a solution contains hydroxide ions. [1 mark]
June 2025, AS Paper 1, Q17 (1 mark): Which silver halide(s) react(s) with concentrated ammonia solution to form a colourless solution? [1 mark] A silver chloride only B silver chloride and silver b
June 2024, Paper 1, Q05.1 (1 mark): Give an equation to show how chlorine forms an acidic solution in water. [1 mark]
June 2024, Paper 1, Q05.2 (1 mark): Give an equation for the reaction between chlorine and cold, dilute aqueous sodium hydroxide. [1 mark]
June 2024, Paper 1, Q05.4 (2 marks): Give the equation for the reaction of solid sodium chloride with concentrated sulfuric acid. State the role of the chloride ions in this reaction. [2 marks] Equ
June 2024, Paper 3, Q20 (1 mark): Which statement correctly describes a trend down Group 7 from Cl to I? X represents Cl, Br or I [1 mark] A The boiling point of HX increases. B The bond dissoci
June 2024, Paper 3, Q21 (1 mark): Which statement about chloride ions is correct? [1 mark] A They are oxidised by concentrated sulfuric acid. B They form a cream precipitate with silver nitrate
June 2024, AS Paper 1, Q01.1 (2 marks): Identify the halide ion present in Q. Give the ionic equation for the reaction that occurs when bromine water is added to Q. [2 marks] Halide ion in Q Ionic equ
June 2024, AS Paper 1, Q01.2 (2 marks): Explain, in terms of oxidising ability, why the observations from these reactions do not allow the student to identify the halide ion present in P and the halid
June 2024, AS Paper 1, Q01.3 (3 marks): The student does a second experiment to determine the halide ion in each of P and R. The student adds a few drops of aqueous silver nitrate solution to 2 cm3 of
June 2024, AS Paper 1, Q04 (6 marks): A student is provided with separate unlabelled samples of four different solutions for analysis. The four solutions are known to be ammonium nitrate, potassium
June 2024, AS Paper 1, Q13 (1 mark): Which species is never formed during the reactions of chlorine with water? [1 mark] A Chloride ions B Chlorate(I) ions C Hydrogen D Oxygen
June 2024, AS Paper 1, Q19 (1 mark): Which of these solid sodium halides does not reduce concentrated sulfuric acid? [1 mark] A NaAt B NaBr C NaCl D NaI
June 2023, Paper 3, Q22 (1 mark): Which species is the strongest reducing agent? [1 mark] A F2 B I2 C F– D I–
June 2023, AS Paper 1, Q06.1 (2 marks): Explain why the electronegativity of the halogens decreases down the group. [2 marks]
June 2023, AS Paper 1, Q06.2 (2 marks): State one similarity in, and one difference between, these reactions. [2 marks] Similarity Difference
June 2023, AS Paper 1, Q06.3 (3 marks): Solid sodium iodide reacts with concentrated sulfuric acid to form hydrogen sulfide. Give a half-equation to show the oxidation of iodide ions. Give a half-equa
June 2023, AS Paper 1, Q19 (1 mark): Which solution contains carbonate ions? [1 mark] A Solution P B Solution Q C Solution R D Solution S
June 2023, AS Paper 1, Q20 (1 mark): What could be the identity of the compound in solution P? [1 mark] A MgBr2 B BaBr2 C MgCl2 D BaCl2
June 2023, AS Paper 1, Q21 (1 mark): What observation is expected in Test 2 for solution S? [1 mark] A No visible change B Effervescence C White precipitate D Pale yellow precipitate
June 2023, AS Paper 1, Q22 (1 mark): In Test 2, the mixture formed by solution S is filtered. Which substance is present in the filtrate? [1 mark] A AgBr B Agl C Ba(NO3)2 D Mg(NO3)2
June 2023, AS Paper 1, Q23 (1 mark): What could be the identity of the compound in solution T? [1 mark] A MgCl2 B BaCl2 C MgBr2 D BaBr2
June 2022, Paper 1, Q06.1 (1 mark): Chlorine is added to some drinking water supplies to decrease the risk of people suffering from diseases such as cholera. State why the amount of chlorine added
June 2022, Paper 1, Q06.2 (2 marks): Give an equation for the reaction of chlorine with water to form a solution containing two acids. Explain, with reference to electrons, why this is a redox reac
June 2022, Paper 1, Q06.3 (2 marks): A student bubbles chlorine gas through a solution of sodium iodide. State the observation the student would make. Give an ionic equation for the reaction. [2 ma
June 2022, Paper 1, Q06.4 (3 marks): The student adds a few drops of concentrated sulfuric acid to a small amount of solid sodium iodide. Two gaseous sulfur-containing products are formed. Give an
June 2022, Paper 1, Q06.5 (3 marks): The student adds a few drops of acidified silver nitrate solution to a solution of an unknown impure sodium halide. The student observes bubbles of gas and a co
June 2022, Paper 3, Q18 (1 mark): A test for chloride ions in aqueous solution involves adding dilute nitric acid followed by aqueous silver nitrate. What is the reason for adding the nitric aci
June 2022, AS Paper 1, Q06.3 (2 marks): When iodide ions are oxidised using concentrated sulfuric acid, sulfur dioxide, a yellow solid and a foul-smelling gas are all formed. Give an equation to show
June 2022, AS Paper 1, Q08.1 (2 marks): Identify the gas formed in Test 1. Describe a further test to confirm the identity of this gas. [2 marks] Identity of gas Test
June 2022, AS Paper 1, Q08.2 (2 marks): Explain how the observations from Test 1 and Test 2 can be used to show that solution B contains hydrochloric acid. [2 marks]
June 2022, AS Paper 1, Q08.3 (4 marks): Describe a series of tests that the student can use to show that solution C contains ammonium sulfate. [4 marks]
June 2022, AS Paper 1, Q08.4 (2 marks): The student does an additional experiment to show that solution D contains a mixture of halide ions. One of the halide ions is chloride. Method: Step 1 Add an e
June 2022, AS Paper 1, Q16 (1 mark): Which is a correct trend down Group 7 from fluorine to iodine? [1 mark] A The boiling point of the element decreases. B The oxidising ability of the element dec
June 2022, AS Paper 1, Q18 (1 mark): Which statement is correct? [1 mark] A Chloride ions reduce concentrated sulfuric acid to form sulfur dioxide. B Bromide ions reduce concentrated sulfuric acid
June 2022, AS Paper 1, Q21 (1 mark): Which species is not a possible product of the reactions between chlorine and water? [1 mark] A Cl– B ClO– C O2 D OH–
November 2021, Paper 3, Q04.1 (2 marks): Give an equation for the reaction of solid sodium bromide with concentrated sulfuric acid to form bromine. State one observation made during this reaction. [2 m
November 2021, Paper 3, Q04.2 (5 marks): A solution that is thought to contain chloride ions and iodide ions is tested. 1. Dilute nitric acid is added to the solution. 2. Aqueous silver nitrate is adde
November 2021, Paper 3, Q08 (1 mark): Which statement about chloride ions is not correct? [1 mark] A They form a white precipitate with silver nitrate solution that is soluble in dilute aqueous ammo
November 2021, AS Paper 1, Q04.2 (2 marks): Different gases are formed when solution B reacts in Test 1 and in Test 2. Suggest the identity of each gas. Give the simplest ionic equation for the formation
November 2021, AS Paper 1, Q04.3 (3 marks): The student thinks that solution C contains either chloride ions or bromide ions. Describe a further test, or tests, to show whether solution C contains chlorid
November 2021, AS Paper 1, Q05.2 (2 marks): Give an equation for the reaction of chlorine with water. Give a reason why chlorine is added to drinking water. [2 marks] Equation Reason
November 2021, AS Paper 1, Q05.3 (1 mark): Chlorine reacts with cold, aqueous sodium hydroxide in the manufacture of bleach. Give an equation for this reaction. [1 mark]
November 2021, AS Paper 1, Q19 (1 mark): Which pair of solutions, when mixed, reacts to form a dark brown solution? [1 mark] A NaF(aq) + Cl2(aq) B NaCl(aq) + Br2(aq) C NaBr(aq) + Cl2(aq) D NaI(aq) + Br
November 2021, AS Paper 1, Q20 (1 mark): Some solid sodium halides are reacted with concentrated sulfuric acid. Which solid sodium halide does not produce a sulfur-containing gas as one of the products
November 2020, Paper 1, Q09.1 (1 mark): State what is observed when silver nitrate solution is added to sodium fluoride solution. [1 mark]
November 2020, Paper 1, Q09.2 (3 marks): State one observation when solid sodium chloride reacts with concentrated sulfuric acid. Give an equation for the reaction. State the role of the chloride ions
November 2020, Paper 1, Q09.3 (3 marks): Give an equation for the redox reaction between solid sodium bromide and concentrated sulfuric acid. Explain, using oxidation states, why this is a redox reacti
November 2020, Paper 1, Q09.4 (2 marks): State what is observed when aqueous chlorine is added to sodium bromide solution. Give an ionic equation for the reaction. [2 marks] Observation Ionic equation
November 2020, Paper 3, Q15 (1 mark): In the test for a halide ion in aqueous solution, dilute nitric acid is added before the addition of silver nitrate solution. Why is nitric acid added? [1 mark]
November 2020, Paper 3, Q16 (1 mark): Which shows the major product(s) formed when chlorine reacts with cold, dilute, aqueous sodium hydroxide? [1 mark] A NaCl only B NaClO only C NaCl and NaClO D N
November 2020, AS Paper 1, Q07.1 (3 marks): Chlorine is used to treat water even though it is toxic to humans. Give one reason why water is treated with chlorine. Explain why chlorine is added to water ev
November 2020, AS Paper 1, Q07.2 (4 marks): Solid sodium iodide reacts with concentrated sulfuric acid to form iodine and sulfur in a redox reaction. Give a half-equation to show the conversion of iodide
November 2020, AS Paper 1, Q07.3 (1 mark): Silver nitrate is added to the solution. Suggest why an excess is used. [1 mark]
November 2020, AS Paper 1, Q17 (1 mark): Which property increases down Group 7? [1 mark] A ability to oxidise a given reducing agent B boiling point C electronegativity D first ionisation energy
November 2020, AS Paper 1, Q22 (1 mark): Which equation shows a redox reaction that does not occur? [1 mark] A Br2(aq) + 2 KI(aq) → I2(aq) + 2 KBr(aq) B Cl2(g) + 2 KI(aq) → I2(aq) + 2 KCl(aq) C Cl2(g)
June 2019, Paper 1, Q05.1 (2 marks): Solid sodium chloride reacts with concentrated sulfuric acid. Give an equation for this reaction. State the role of the sulfuric acid in this reaction. [2 marks
June 2019, Paper 1, Q05.2 (3 marks): Fumes of sulfur dioxide are formed when sodium bromide reacts with concentrated sulfuric acid. For this reaction • give an equation • give one other observation
June 2019, Paper 1, Q05.3 (1 mark): Chlorine reacts with hot aqueous sodium hydroxide as shown in the equation. 3 Cl2 + 6 NaOH → NaClO3 + 5 NaCl + 3 H2O Give the oxidation state of chlorine in NaC
June 2019, Paper 1, Q05.4 (1 mark): State, in terms of redox, what happens to chlorine in the reaction in Question 05.3. [1 mark]
June 2019, Paper 1, Q05.5 (6 marks): Solution Y contains two different negative ions. To a sample of solution Y in a test tube a student adds • silver nitrate solution • then an excess of dilute ni
June 2019, Paper 3, Q16 (1 mark): An aqueous solution of a salt gives a white precipitate when mixed with aqueous silver nitrate and when mixed with dilute sulfuric acid. Which could be the form
June 2019, Paper 3, Q17 (1 mark): Which statement is not correct about the trends in properties of the hydrogen halides from HCl to HI ? [1 mark] A The boiling points decrease. B The bond dissoc
June 2019, AS Paper 1, Q08.2 (3 marks): NaCl(aq) and Na2CO3(aq) [3 marks] Reagent Observation with NaCl Observation with Na2CO3 Section B Answer all questions in this section. Only one answer per ques
June 2019, AS Paper 1, Q19 (1 mark): What is the best oxidising agent? [1 mark] A F2 B F– C I2 D I–
June 2019, AS Paper 1, Q22 (1 mark): Which statement is correct about reactions involving halide ions? [1 mark] A Sodium chloride forms chlorine when added to concentrated sulfuric acid. B Sodium c
June 2018, Paper 3, Q18 (1 mark): Chlorine reacts with cold, dilute, aqueous sodium hydroxide. Which is a complete list of the products? [1 mark] A Sodium chloride, sodium chlorate(I) and water
June 2018, AS Paper 1, Q04.1 (6 marks): Separate unlabelled solid samples of three anhydrous sodium compounds are provided for a student to identify. These compounds are known to be sodium carbonate,
June 2018, AS Paper 1, Q07.3 (1 mark): Chlorine is reacted with cold, aqueous sodium hydroxide in the manufacture of bleach. Give an equation for this reaction between chlorine and sodium hydroxide.
June 2018, AS Paper 1, Q16 (1 mark): Which statement is correct about the reaction between concentrated sulfuric acid and solid sodium bromide? [1 mark] A Bromide ions are reduced. B Hydrogen bromi
June 2017, Paper 1, Q01.4 (2 marks): Identify a reagent that could be used to indicate the presence of iodide ions in an aqueous solution and describe the observation made. [2 marks] Reagent Observ
June 2017, Paper 3, Q02.7 (2 marks): Concentrated sulfuric acid reacts with solid sodium chloride. Give the observation you would make in this reaction. State the role of the sulfuric acid. [2 mark
June 2017, Paper 3, Q02.8 (3 marks): Concentrated sulfuric acid reacts with solid sodium iodide, to produce several products. Observations made during this reaction include the formation of a black
June 2017, AS Paper 1, Q10: Which is the best technique to remove the silver chloride that forms when aqueous solutions of silver nitrate and sodium chloride react? [1 mar A Refluxing B Ev
June 2017, AS Paper 1, Q11 (1 mark): Which statement about astatine is correct? [1 mark A Astatine has a greater electronegativity than bromine B Astatine is a better oxidising agent than bromine C
June 2017, AS Paper 1, Q23: Which species is not produced by a redox reaction between solid sodium iodide and concentrated sulfuric acid? [1 mar A Na2SO4 B H2S C S D SO2

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