plumiInorganic chemistry and the periodic table: OCR A‑Level Chemistry B questions
Every OCR A-Level Chemistry B exam question on ES Inorganic chemistry and the periodic table (specification points ES(h)–(n)), 2016–2025, with its mark scheme and examiner’s report.
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Calculations
Q24(b)(i)
The whole paper ↗![June 2025 AS Paper 1, question 24(b)(i): Write an ionic equation for the reaction that occurs. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h03301-jun25-24-bi-qp.webp?v=3)
Q24(b)(ii)
The whole paper ↗![June 2025 AS Paper 1, question 24(b)(ii): Explain, in terms of electrons, why this reaction indicates that chlorine is more reactive than iodine. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h03301-jun25-24-bii-qp.webp?v=3)
Q24(c)
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Q3(a)
The whole paper ↗![June 2024 Paper 3, question 3(a): Write an ion-electron half-equation to show what occurs when chlorine acts as an oxidising agent. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43303-jun24-03-a-qp.webp?v=3)
Q3(b)
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Q1(e)(i)
The whole paper ↗![June 2024 AS Paper 2, question 1(e)(i): Which halide ion is definitely not present? Give a reason. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h03302-jun24-01-ei-qp.webp?v=3)
Q1(e)(ii)
The whole paper ↗![June 2024 AS Paper 2, question 1(e)(ii): Describe further tests they can do on the precipitate to decide which of the remaining halides is present. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h03302-jun24-01-eii-qp.webp?v=3)
Q1(f)(i)
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Q1(f)(ii)
The whole paper ↗![June 2024 AS Paper 2, question 1(f)(ii): Write an ionic equation for the reaction of bromine with the halide. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h03302-jun24-01-fii-qp.webp?v=3)
Q1(f)(iii)
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Q1(a)(i)
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Q1(a)(iii)
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Q1(b)
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Q1(c)(i)
The whole paper ↗![June 2023 Paper 2, question 1(c)(i): Write an ionic equation for the reaction of silver ions with bromide ions. Show state symbols. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43302-jun23-01-ci-qp.webp?v=3)
All 86 questions on Inorganic chemistry and the periodic table, as a list
- June 2025, Paper 1, Q5 (1 mark): Which statement about the element astatine, At, is likely to be correct? A It displaces iodine from sodium iodide. B It is a gas at room temperature. C It is a
- June 2025, Paper 1, Q13 (1 mark): Chlorine is added to water to prevent the spread of bacterial diseases. Why must the levels of chlorine in the water be carefully monitored? A Chlorine is a gre
- June 2025, Paper 1, Q15 (1 mark): Which pair will react to produce brown vapours? A NaCl and concentrated H3PO4 B NaCl and concentrated H2SO4 C NaBr and concentrated H2SO4 D NaI and concentrated
- June 2025, Paper 1, Q18 (1 mark): In which of the following reactions is the hydrogen halide acting as a reducing agent? A 2HBr + 2Na 2NaBr + H2 B HCl + AgNO3 HNO3 + AgCl C HCl + NaOH NaCl + H2O
- June 2025, AS Paper 1, Q24(b)(i) (1 mark): Write an ionic equation for the reaction that occurs. [1]
- June 2025, AS Paper 1, Q24(b)(ii) (1 mark): Explain, in terms of electrons, why this reaction indicates that chlorine is more reactive than iodine. [1]
- June 2025, AS Paper 1, Q24(c) (2 marks): A student says that a pure sample of hydrogen iodide can be made by adding concentrated sulfuric acid to solid sodium iodide. Comment on this statement, giving
- June 2024, Paper 3, Q3(a) (1 mark): Write an ion-electron half-equation to show what occurs when chlorine acts as an oxidising agent. [1]
- June 2024, Paper 3, Q3(b) (6 marks): The element chlorine is a powerful oxidising agent. (b)* A student performs a microscale investigation on halogen displacement using a plate with nine small wel
- June 2024, AS Paper 1, Q7 (1 mark): What is a risk, rather than a benefit, of using chlorine solution? A It can be toxic. B It is a disinfectant. C It kills bacteria. D It sterilises water. Your a
- June 2024, AS Paper 1, Q10 (1 mark): What occurs when aqueous chlorine reacts with aqueous iodide ions? 2Cl – Cl 2 + 2e– A B Electrons are transferred from chlorine atoms. I– is oxidised. C D The b
- June 2024, AS Paper 2, Q1(e)(i) (2 marks): Which halide ion is definitely not present? Give a reason. [2]
- June 2024, AS Paper 2, Q1(e)(ii) (2 marks): Describe further tests they can do on the precipitate to decide which of the remaining halides is present. [2]
- June 2024, AS Paper 2, Q1(f)(i) (2 marks): The students add aqueous bromine to a solution of a halide. They then shake the resulting solution with hexane which turns purple. Name the halide ion present,
- June 2024, AS Paper 2, Q1(f)(ii) (1 mark): Write an ionic equation for the reaction of bromine with the halide. [1]
- June 2024, AS Paper 2, Q1(f)(iii) (3 marks): A student says: • Mixing solutions of bromine and sodium chloride would not result in a reaction. • This is because the chloride ion is a stronger reducing agen
- June 2023, Paper 2, Q1(a)(i) (2 marks): Excess chlorine is added to acidified seawater, forming aqueous bromine. Write an ionic equation for the reaction of chlorine with bromide ions and explain how
- June 2023, Paper 2, Q1(a)(iii) (2 marks): Concentrated Br2 is made from the concentrated HBr by displacement using chlorine. Complete the table to give the properties of chlorine, bromine and iodine. Co
- June 2023, Paper 2, Q1(b) (2 marks): Some of the hazards of transporting bromine are similar to those of transporting chlorine. Suggest two hazards of transporting bromine in a road tanker. Hazard
- June 2023, Paper 2, Q1(c)(i) (2 marks): Write an ionic equation for the reaction of silver ions with bromide ions. Show state symbols. [2]
- June 2023, Paper 2, Q1(c)(ii) (2 marks): Suggest why the students do not get the result they expect. [2]
- June 2023, AS Paper 1, Q3 (1 mark): Which of these properties of chlorine is a benefit to humankind? A It is a bleach. B It is a gas. C It is toxic to humans. D It is pale green. Your answer [1]
- June 2023, AS Paper 1, Q22(d) (2 marks): When CH3Cl is bubbled through a warm solution of silver ions in aqueous ethanol, a precipitate forms slowly. Write an ionic equation for the formation of the pr
- June 2023, AS Paper 2, Q2(a) (1 mark): Describe the appearance and physical state of bromine at room temperature. [1]
- June 2023, AS Paper 2, Q2(b)(i) (3 marks): Explain, in terms of electrons, why chlorine is more reactive than bromine. [3]
- June 2023, AS Paper 2, Q2(c) (2 marks): A student adds aqueous silver nitrate to an aqueous sodium halide. A precipitate forms but the student is unsure whether it is silver bromide or silver iodide.
- June 2023, AS Paper 2, Q2(f) (4 marks): A student adds concentrated phosphoric acid to an unknown solid sodium halide in a test tube. When the test tube is warmed, a colourless gas is given off. When
- June 2022, Paper 1, Q31(b) (2 marks): The extraction process for bromine involves bubbling chlorine gas through sea water. The equation for the reaction is shown below. 2Br–(aq) + Cl 2(g) Br2(aq) +
- June 2022, Paper 1, Q31(e)(i) (1 mark): Write an ionic equation for the reaction that has occurred in tube C. Show state symbols. [1]
- June 2022, Paper 1, Q31(e)(ii) (2 marks): Describe what the student would do to the precipitates to distinguish between the halide ions in tubes A and B. State the expected results. [2]
- June 2022, Paper 1, Q31(f)(i) (1 mark): Write an equation to show why a brown vapour is produced when hydrogen bromide reacts with sulfuric acid. [1]
- June 2022, Paper 1, Q31(f)(ii) (1 mark): State how the student can produce pure hydrogen bromide. [1]
- June 2022, AS Paper 1, Q6 (1 mark): What is a correct property of hydrogen iodide gas? A It has high thermal stability. B It is neutral in solution. C It is unreactive with ammonia. D It reduces s
- June 2022, AS Paper 1, Q15 (1 mark): Silver nitrate solution, followed by ammonia solution, is added to solutions of the potassium halides. What is correct? A Potassium bromide gives a yellow preci
- November 2021, Paper 1, Q26 (1 mark): What is correct about the laboratory preparation of hydrogen chloride gas? A Chlorine is produced as a by-product. B Concentrated sulfuric acid is used. C NaCl
- November 2021, Paper 3, Q3(a)(i) (1 mark): Write an ionic equation for the reaction. [1]
- November 2021, Paper 3, Q3(a)(ii) (1 mark): Identify the coloured layers. [1]
- November 2021, AS Paper 1, Q9 (1 mark): Which statement about the action of concentrated acids on halides is correct? A Chlorides form HCl and H2S when reacted with sulfuric acid. B HBr can be prepare
- November 2021, AS Paper 2, Q2(a)(i) (1 mark): Write the chemical equation for this reaction. [1]
- November 2021, AS Paper 2, Q2(a)(ii) (1 mark): Hydrogen iodide can be similarly prepared from sodium iodide but an acid different from sulfuric acid must be used. Name the acid. [1]
- November 2021, AS Paper 2, Q2(b)(i) (2 marks): X is a hydrogen halide that gives a red/brown vapour on heating. Suggest, with a reason, the name of X. [2]
- November 2021, AS Paper 2, Q2(b)(ii) (2 marks): Give a test on a solution of X that would verify your choice in (b)(i). [2]
- November 2021, AS Paper 2, Q2(e)(ii) (1 mark): Explain, in terms of electrons, why a bromine atom is more reactive than an iodine atom. [1]
- November 2021, AS Paper 2, Q2(e)(iii) (1 mark): The reaction in Equation 2.2 is carried out in a test tube. Some of the colourless organic solvent cyclohexane is added to the reaction mixture. The tube is sha
- November 2020, Paper 1, Q32(a) (1 mark): Give one hazard of transporting chlorine or bromine. [1]
- November 2020, Paper 1, Q32(c)(i) (1 mark): Describe what is seen when chlorine is added to a solution of bromide ions. [1]
- November 2020, Paper 1, Q32(c)(ii) (1 mark): Give an ionic equation for the reaction that takes place. [1]
- November 2020, Paper 1, Q32(c)(iii) (1 mark): Explain, in terms of electrons, why the reaction takes place. [1]
- November 2020, Paper 1, Q32(e)(ii) (1 mark): Construct an equation for the reaction of concentrated sulfuric acid with hydrogen bromide. [1]
- November 2020, Paper 1, Q35(a)(i) (1 mark): Describe what is observed when silver nitrate is added to the seawater. [1]
- November 2020, Paper 1, Q35(a)(ii) (1 mark): Give an ionic equation for the reaction, including state symbols. [1]
- November 2020, AS Paper 1, Q6 (1 mark): A solution of X gives a green flame colour and a white precipitate with aqueous silver nitrate. What is X? A Barium chloride B Barium sulfate C Iron(II) chlorid
- November 2020, AS Paper 1, Q11 (1 mark): Y is a hydrogen halide. It reduces sulfuric(VI) acid to hydrogen sulfide, H2S. What is Y? A HF B HCl C HBr D HI Your answer [1]
- November 2020, AS Paper 1, Q23(b)(iii) (1 mark): Give one safety precaution that must be taken when working with chlorine gas. [1]
- November 2020, AS Paper 1, Q23(e)(i) (2 marks): Some students mix a solution of chlorine with a solution of sodium iodide. Describe what they would observe and write an equation for the reaction. Observation
- November 2020, AS Paper 1, Q23(e)(ii) (1 mark): A halogen is formed in part (e)(i). Suggest a test that would confirm which halogen it is and state the result of the test. [1]
- June 2019, Paper 2, Q3(d)(i) (1 mark): Write an equation for the reaction that occurs. [1]
- June 2019, Paper 2, Q3(d)(iii) (1 mark): What will be seen when the reaction in (d)(i) occurs? [1]
- June 2019, Paper 2, Q3(d)(iv) (1 mark): Explain, in terms of electrons, why chlorine is more reactive than iodine. [1]
- June 2019, Paper 2, Q3(e) (2 marks): The student uses a simple apparatus to prepare a test-tube full of hydrogen chloride gas in the laboratory. Draw a diagram of an apparatus the student could use
- June 2019, AS Paper 1, Q11 (1 mark): What is a property of solid iodine? A It is very soluble in water. B It is purple in colour. C It dissolves in organic solvents. D It melts when heated at room
- June 2019, AS Paper 1, Q12 (1 mark): Silver nitrate solution is added to solutions of sodium halides. Which row is correct? Halide Precipitate formed with silver nitrate A chloride white, insoluble
- June 2019, AS Paper 1, Q13 (1 mark): What is the action (if any) of concentrated sulfuric acid on HBr? A No reaction B Forms SO2 C Forms H2S D Forms sulfur Your answer [1]
- June 2019, AS Paper 2, Q2(b)(ii) (2 marks): Chloric(I) acid can also be produced by adding solid calcium chlorate(I) to water. Suggest a reason why it may be preferable to use calcium chlorate(I) rather t
- June 2019, AS Paper 2, Q2(e) (1 mark): The solution containing bromide ions is then treated with chlorine and steam before the bromine produced is separated by fractional distillation. Describe the s
- June 2019, AS Paper 2, Q2(f)(i) (1 mark): A student is given a solution of bromide ions. The student adds acidified silver nitrate to the solution of bromide ions. Ag+ + Br – AgBr Describe what the stud
- June 2018, Paper 1, Q7 (1 mark): Chlorine reacts with bromide ions in sea water, producing bromine. Which statement about this process is not correct? A Bromide ions are oxidised. B The chlorin
- June 2018, Paper 3, Q3(a)(i) (1 mark): Describe what the students would observe if the only halide ion present in the solution was the iodide. [1]
- June 2018, Paper 3, Q3(a)(ii) (1 mark): Write an ionic equation for this reaction. Include state symbols. [1]
- June 2018, AS Paper 1, Q3 (1 mark): What is not a property of hydrogen iodide? A It reacts with ammonia. B It is soluble in water. C It is stable to heat. D It reacts with sodium hydroxide. Your a
- June 2018, AS Paper 1, Q10 (1 mark): Which statement about the reactions of solid halides with concentrated sulfuric acid is correct? A Chlorides produce HCl as the only gas. B Bromides produce HBr
- June 2018, AS Paper 2, Q4(c)(i) (1 mark): Give the result of the test for chloride ions. [1]
- June 2018, AS Paper 2, Q4(c)(ii) (2 marks): Suggest why the student might not get this result. [2]
- June 2018, AS Paper 2, Q4(d)(ii) (2 marks): A student carries out a displacement reaction to show that chlorine is more reactive than iodine. Describe the experiment the student would do and the expected
- June 2018, AS Paper 2, Q4(d)(iii) (1 mark): Write an ionic equation for the reaction in (ii). [1]
- June 2018, AS Paper 2, Q4(d)(iv) (2 marks): Describe and explain, in terms of electrons, why chlorine is more reactive than iodine. [2]
- June 2017, Paper 1, Q31(c) (1 mark): Industries using chlorine are often located close to the electrolysis plant. Why is the transportation of chlorine dangerous? [1]
- June 2017, Paper 1, Q31(e) (1 mark): Hydrogen chloride can be prepared by reacting potassium chloride with concentrated sulfuric acid. Give the equation for the reaction. [1]
- June 2017, AS Paper 1, Q4 (1 mark): What is correct about hydrogen bromide? A It reacts with concentrated sulfuric acid to form Br2 and H2S. B It forms white fumes with ammonia. C Its Mr is 79.9.
- June 2017, AS Paper 1, Q8 (1 mark): Which row is correct for the silver halide shown? Halide Colour Solubility in ammonia A silver chloride white soluble B silver bromide yellow insoluble C silver
- June 2017, AS Paper 2, Q3(e)(i) (1 mark): What is the colour of the lower layer? [1]
- June 2017, AS Paper 2, Q3(e)(ii) (1 mark): Write the ionic equation for the reaction between the aqueous solutions of bromine and the sodium halide. [1]
- June 2017, AS Paper 2, Q3(g) (3 marks): + 2OH–(aq) + H2(g) (g) The oxidising strength of the halogens decreases going down the Group. Explain this trend. [3]
- June 2016, AS Paper 1, Q8 (1 mark): Concentrated sulfuric acid is warmed with sodium bromide. Which products are formed? A HBr as the only gas B no products C H2S, Br2 and HBr D SO2, Br2 and HBr Y
- June 2016, AS Paper 1, Q23(a)(i) (1 mark): Write an ionic equation for the reaction of bromide ions with chlorine. [1]
- June 2016, AS Paper 1, Q23(a)(ii) (1 mark): What information does the reaction in (i) give about the relative reactivities of the two halogens involved? Give your answer in terms of electrons. [1]
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