plumiThe elements of Group 7 (halogens): Edexcel A‑Level Chemistry questions
Every Edexcel A-Level Chemistry exam question on 4B The elements of Group 7 (halogens), 2016–2025, with its mark scheme and examiner’s report.
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Q6(a)(i)
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Q6(a)(ii)
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Q6(d)(i)
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Q6(d)(ii)
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Q3(b)
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Q3(d)(ii)
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Q4(a)(i)
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Q4(a)(ii)
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Q5(a)
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Q7(a)
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Q5(a)(ii)
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Q5(a)(iii)
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Q3(a)
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Q3(b)(i)
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Q3(b)(ii)
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Q3(b)(iii)
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Q3(a)(ii)
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Q3(b)(ii)
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Q5(b)
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Q3(a)
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All 67 questions on The elements of Group 7 (halogens), as a list
- June 2025, AS Paper 1, Q6(a)(i) (2 marks): Explain how the equation indicates that the reaction should be carried out in a fume cupboard rather than in the laboratory. (2)
- June 2025, AS Paper 1, Q6(a)(ii) (2 marks): Give two observations that would be made when the reaction shown by the equation is carried out in a fume cupboard. (2)
- June 2025, AS Paper 1, Q6(d)(i) (1 mark): Identify, by name or formula, the misty fumes. (1)
- June 2025, AS Paper 1, Q6(d)(ii) (2 marks): Explain what this observation indicates about the relative strength of the chloride ion and the iodide ion as reducing agents. (2)
- June 2024, Paper 1, Q3(b) (2 marks): Separate aqueous solutions of calcium bromide and of calcium iodide reacted with acidified silver nitrate to produce a precipitate. Concentrated aqueous ammonia
- June 2024, Paper 2, Q3(d)(ii) (2 marks): The foam produced often has a slight yellow / brown colour. Explain what causes this colour, which is not caused by the detergent. (2)
- June 2024, AS Paper 1, Q4(a)(i) (3 marks): Give the observations that the student would make in each case. (3) KCl . KBr KI
- June 2024, AS Paper 1, Q4(a)(ii) (3 marks): Describe how the student could confirm the halide ions present in the products of (a)(i) by adding ammonia solutions. (3)
- June 2024, AS Paper 1, Q5(a) (2 marks): Chlorine dioxide is very toxic by inhalation and skin absorption. State two precautions that must be taken when preparing chlorine dioxide in a laboratory. You
- June 2024, AS Paper 1, Q7(a) (6 marks): Potassium chloride and potassium bromide are white crystalline solids which react with concentrated sulfuric acid. Give the observations in these reactions and
- June 2024, AS Paper 2, Q5(a)(ii) (1 mark): Give the name or formula of the oxidising agent responsible for the unwanted redox reactions. (1)
- June 2024, AS Paper 2, Q5(a)(iii) (2 marks): Identify, by name or formula, one of the unwanted inorganic products and one of the organic products resulting fr
- June 2023, Paper 1, Q3(a) (1 mark): Which change occurs when concentrated sulfuric acid is added to potassium bromide? (1) A bromide ions oxidise sulfuric acid forming sulfur B bromide ions oxidis
- June 2023, Paper 1, Q3(b)(i) (1 mark): Which statement is correct for bromide ions? (1) A a white precipitate forms that dissolves in concentrated ammonia only B a white precipitate forms that dissol
- June 2023, Paper 1, Q3(b)(ii) (1 mark): Give a reason why the silver nitrate must be acidified. (1)
- June 2023, Paper 1, Q3(b)(iii) (2 marks): Explain which acid needs to be used to acidify the silver nitrate solution and why other acids are unsuitable. (2)
- June 2023, AS Paper 1, Q3(a)(ii) (1 mark): Which is not true when calcium reacts with bromine? (1) A bromine reacts less vigorously than chlorine B during the reaction bromine oxidises the calcium C the
- June 2023, AS Paper 1, Q3(b)(ii) (3 marks): The relative reactivity of chlorine and iodine can be demonstrated using the reaction between one of these elements and the potassium salt of the other halogen.
- June 2023, AS Paper 1, Q5(b) (3 marks): Explain the trend in electronegativity for the Group 7 elements. (3)
- June 2022, Paper 1, Q3(a) (1 mark): What is the colour of iodine in the solid and gas states? (1) Colour of iodine solid Colour of iodine gas A purple brown B purple purple C grey/black brown D gr
- June 2022, Paper 1, Q3(b) (1 mark): Which of these reactions occurs? (1) A Br2(aq) + 2NaCl(aq) → 2NaBr(aq) + Cl2(aq) B Br2(aq) + 2NaF(aq) → 2NaBr(aq) + F2(aq) C Cl2(aq) + 2NaBr(aq) → 2NaCl(aq) + B
- June 2022, Paper 1, Q3(e)(ii) (1 mark): What type of reaction occurs when ammonia gas reacts with hydrogen chloride gas? (1) A acid‑base B displacement C redox D substitution
- June 2022, AS Paper 1, Q3(d)(i) (1 mark): Write the name of the reagent used to test for the anion. (1)
- June 2022, AS Paper 1, Q3(d)(ii) (2 marks): State the expected result of this test and the formula of the product. (2) Result of test Formula of the product
- June 2022, AS Paper 1, Q8(b)(ii) (2 marks): When concentrated hydrochloric acid on a glass rod is held above a concentrated ammonia solution, a white smoke is observed. Write an equation, including state
- November 2021, Paper 1, Q5(b)(i) (2 marks): Sodium chlorate(I) can be made by the reaction of chlorine with sodium hydroxide. Show, by using oxidation numbers, that this reaction is disproportionation. 2N
- November 2021, Paper 1, Q5(b)(ii) (1 mark): A different bleaching agent can be made by the reaction of chlorine with sodium hydroxide under different conditions. Balance this equation. NaOH + Cl2 → NaClO3
- November 2021, Paper 1, Q5(b)(iii) (1 mark): What conditions are required for the reaction in (b)(ii)? (1) A cold and dilute alkali B cold and concentrated alkali C hot alkali D excess chlorine
- November 2021, Paper 1, Q5(c) (1 mark): The halogens can be identified by their colour in an organic solvent such as hexane or cyclohexane. Which sequence of colours is correct for chlorine, bromine a
- November 2021, Paper 1, Q5(d)(i) (2 marks): Write the ionic equation for the reaction between aqueous solutions of sodium iodide and silver nitrate. Include state symbols. (2)
- November 2021, Paper 1, Q5(d)(ii) (2 marks): A solution containing 0.010 mol of a halide ion was reacted with excess silver nitrate and produced 1.88 g of precipitate. Identify the halide ion. Justify your
- November 2021, AS Paper 1, Q6(a)(i) (1 mark): The equation for this reaction for potassium chloride can be written KCl + H2SO4 → HCl + KHSO4 The hydrogen chloride does not react further. State why this reac
- November 2021, AS Paper 1, Q6(a)(ii) (3 marks): On descending Group 7, the hydrogen halides become better reducing agents. Explain how the reactions of potassium chloride, potassium bromide and potassium iodi
- November 2021, AS Paper 1, Q6(b)(ii) (2 marks): With hot sodium hydroxide solution, a different disproportionation reaction occurs. Sodium chlorate(V) is one of the products. Complete the equation for this re
- October 2020, AS Paper 1, Q5(a)(i) (1 mark): When chlorine gas is bubbled through an aqueous solution of potassium iodide, the reaction involves (1) A oxidation only B reduction only C redox D disproportio
- October 2020, AS Paper 1, Q5(a)(ii) (1 mark): Cyclohexane was added to the resulting solution from (a)(i). The mixture was shaken and then allowed to stand for a few minutes. Two layers were formed. [Densi
- October 2020, AS Paper 1, Q5(b)(i) (1 mark): In this exothermic reaction, which of the following mixtures of gases would be produced? (1) A hydrogen iodide and sulfur dioxide only B hydrogen iodide and hyd
- October 2020, AS Paper 1, Q5(b)(ii) (3 marks): Hydrogen iodide is a gas which reacts in a similar way to hydrogen chloride. State the observation when the hydrogen iodide gas is passed over the mouth of an o
- October 2020, AS Paper 1, Q5(c)(i) (3 marks): Outline a procedure that you could use to obtain a sample of dry, solid potassium iodate(V) from the reaction mixture. (3)
- October 2020, AS Paper 1, Q5(c)(ii) (2 marks): Describe how you would show that iodide ions are present in an aqueous solution of potassium iodide. (2)
- October 2020, AS Paper 1, Q5(d) (1 mark): Fluorine is an element in Group 7. Group 7 includes the elements chlorine, bromine and iodine. Some information about the melting and boiling temperatures of Gr
- October 2020, AS Paper 2, Q7(b)(i) (1 mark): State how the halogen atom present in each halogenoalkane can be identified using observations from this experiment in (a). (1)
- October 2020, AS Paper 2, Q7(b)(ii) (2 marks): Identify further reagents that can be added, including relevant observations, to confirm the identity of the halogen atom present in each halogenoalkane. (2)
- June 2019, Paper 1, Q2(a)(i) (1 mark): Write an equation for this reaction. State symbols are not required. (1)
- June 2019, Paper 1, Q2(a)(ii) (3 marks): Silver nitrate solution was added to the mixture in (a) and excess dilute ammonia solution was then added to the precipitate formed. Only some of the precipitat
- June 2019, Paper 1, Q2(a)(iii) (1 mark): Aqueous potassium bromide was added to aqueous iodine, instead of chlorine water. There was no reaction. Give a reason why no reaction occurred. (1)
- June 2019, Paper 1, Q2(b)(i) (1 mark): Complete the ionic equation for this reaction. State symbols are not required. (1) Cl2 + OH– o Cl– + ClO3 – + H2O
- June 2019, Paper 1, Q2(b)(ii) (2 marks): Explain, in terms of oxidation numbers, why this is a disproportionation reaction. (2)
- June 2019, Paper 3, Q8(a)(iii) (2 marks): The student corrected the errors. While the mixture was heating under reflux, the student noticed a small amount of a brown vapour was formed. Explain why the b
- June 2019, AS Paper 1, Q6(b)(i) (1 mark): Give the formula of a reagent that would produce a cream-coloured precipitate when added to an aqueous solution of magnesium bromide. (1)
- June 2019, AS Paper 1, Q6(b)(ii) (1 mark): The identity of the anion may be confirmed by testing the solubility of the cream-coloured precipitate in ammonia solution. Which pair of responses helps to con
- June 2019, AS Paper 1, Q9(b)(ii) (3 marks): The table shows some properties of potassium chloride and potassium chlorate(VII). Potassium chloride Potassium chlorate(VII) KCl KClO4 Solubility in water 4.81
- June 2019, AS Paper 1, Q9(d) (4 marks): When chlorine gas is dissolved in water, it reacts according to the equation Cl2 + H2O → HCl + HClO The chloric(I) acid (HClO) produced is much more effective a
- June 2018, Paper 1, Q1(a) (2 marks): Deduce the name of salt A. (2)
- June 2018, Paper 1, Q1(b) (2 marks): Describe additional tests, with the results, that will confirm the identity of the anion in the cream precipitate. (2)
- June 2018, Paper 3, Q1(b) (5 marks): A student carries out experiments to determine the order of reactivity of three halogens: bromine, chlorine and iodine. The student is provided with aqueous sol
- June 2017, Paper 1, Q3(a) (2 marks): The boiling temperatures of three halogens are shown in the table. Boiling temperature Halogen / °C chlorine –35 bromine 59 iodine 184 Explain why the boiling t
- June 2017, Paper 1, Q3(b) (3 marks): Potassium halides react with concentrated sulfuric acid to form potassium hydrogensulfate and the different products shown in the table. Potassium halide Produc
- June 2017, Paper 2, Q3(b)(ii) (2 marks): Give the reagents that are used to test that bromide ions are formed in this reaction mixture. Include the result of the test. (2)
- June 2017, AS Paper 1, Q4(b) (2 marks): A different ion containing chlorine is formed if the solution of aqueous hydroxide ions is hot. Give the formula of the chlorine-containing ion and the oxidatio
- June 2017, AS Paper 1, Q4(c)(i) (1 mark): Bromine can be extracted from seawater containing bromide ions using chlorine. Write the ionic equation for this reaction. State symbols are not required. (1)
- June 2017, AS Paper 1, Q4(c)(ii) (2 marks): Identify one hazard associated with carrying out this reaction in a school laboratory and a safety precaution other than wearing a laboratory coat and eye prote
- June 2016, AS Paper 1, Q1(a)(i) (1 mark): Give the physical states of chlorine and iodine at room temperature and pressure. (1)
- June 2016, AS Paper 1, Q1(a)(ii) (1 mark): Predict the physical state of astatine under these conditions. Justify your answer. (1)
- June 2016, AS Paper 1, Q1(b) (2 marks): Write the equation for the reaction of chlorine with cold, dilute sodium hydroxide solution to form bleach. Name this type of reaction. (2) Type of reaction
- June 2016, AS Paper 1, Q1(c) (1 mark): Hydrogen bromide gas reacts with ammonia gas HBr + NH3 r NH4Br What would be observed during this reaction? (1) A bubbles B decolorisation C steamy fumes D whit
- June 2016, AS Paper 1, Q4(d) (2 marks): Two of the solutions produce the same result on the addition of dilute nitric acid followed by silver nitrate solution. State the observation with this test and
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