Group 17: past paper questions

Where the questions come from

• Question 21May/June 2026, paper 11Multiple choice1 mark

  Which statement is correct?

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• Question 21Oct/Nov 2025, paper 11Multiple choice1 mark

  Equation 1 and equation 2 show two different reactions of halide ion ${\text{Q}}^{-}$ with concentrated sulfuric acid.

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• Question 1Oct/Nov 2024, paper 11Multiple choice1 mark

  In this question Q is used to represent a halogen atom. Magnesium and calcium each form a compound with chlorine and a compound with bromine.

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• Question 11Oct/Nov 2023, paper 11Multiple choice1 mark

  $\mathrm{H}\mathrm{O}\mathrm{C}\mathrm{l}(\mathrm{a}\mathrm{q})$ is the molecule that kills bacteria when chlorine is added to water. The following reaction produces this molecule.

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• Question 22May/June 2026, paper 11Multiple choice1 mark

  Chlorine reacts separately with water, cold aqueous sodium hydroxide and hot aqueous sodium hydroxide. Which statement about these reactions is correct?

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• Question 22Oct/Nov 2025, paper 11Multiple choice1 mark

  What happens when iodine solution is added to a solution of sodium bromide?

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• Question 21Oct/Nov 2024, paper 11Multiple choice1 markHas a diagram

  In reaction 1, concentrated sulfuric acid is added to potassium chloride and the fumes produced are bubbled into aqueous potassium iodide solution. In reaction 2, potassium chloride is dissolved in aqueous ammonia and this is then added to aqueous silver nitrate.

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• Question 22Oct/Nov 2023, paper 11Multiple choice1 mark

  In this question, Q represents an atom of chlorine, bromine or iodine. Which explanation for the variation in volatility down Group 17 is correct?

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• Question 23May/June 2026, paper 11Multiple choice1 mark

  Halide ion ${\text{X}}^{-}$ reacts with concentrated sulfuric acid. Among the products of the reaction is a sulfur-containing compound in which the oxidation number of the sulfur is $-2$. Which halide ion is ${\text{X}}^{-}$?

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• Question 21Oct/Nov 2025, paper 12Multiple choice1 mark

  In an experiment, $0.600\text{ mol}$ of chlorine gas, ${\text{Cl}}_2$, is reacted with an excess of hot aqueous sodium hydroxide. One of the products is ${\text{NaClO}}_3$. Which mass of ${\text{NaClO}}_3$ is formed?

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• Question 22Oct/Nov 2024, paper 11Multiple choice1 markHas a diagram

  The table refers to the hydrogen halides. Which row is correct?

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• Question 23Oct/Nov 2023, paper 11Multiple choice1 mark

  Which statement about the halogens or halide ions is correct?

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• Question 22May/June 2026, paper 12Multiple choice1 mark

  The volatility of the halogens decreases down the group. What is the explanation for this trend?

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• Question 22Oct/Nov 2025, paper 12Multiple choice1 mark

  $\text{X}$ and $\text{Y}$ are sodium salts of Group 17 elements. When $\text{X}$ reacts with concentrated sulfuric acid, hydrogen sulfide, ${\text{H}}_2\text{S}$, is produced.

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• Question 22Oct/Nov 2024, paper 12Multiple choice1 markHas a diagram

  The colours of the silver halides $\mathrm{A}\mathrm{g}\mathrm{C}\mathrm{l}$, $\mathrm{A}\mathrm{g}\mathrm{B}\mathrm{r}$ and $\mathrm{A}\mathrm{g}\mathrm{I}$ differ. The solubilities of these halides in aqueous ammonia also differ. Which row is correct?

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• Question 12Oct/Nov 2023, paper 12Multiple choice1 mark

  Chlorine reacts with sodium bromide. $$\frac{1}{2}{\text{Cl}}_2+\text{NaBr}\to \text{NaCl}+\frac{1}{2}{\text{Br}}_2$$ Which words correctly describe this reaction?

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• Question 23May/June 2026, paper 12Multiple choice1 mark

  Which is the strongest oxidising agent?

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• Question 23Oct/Nov 2024, paper 12Multiple choice1 mark

  The name 'chlorate' is used for an anion consisting of chlorine and oxygen only.

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• Question 24Oct/Nov 2023, paper 12Multiple choice1 mark

  Iodine has a higher melting point than chlorine. What is the reason for this?

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• Question 21May/June 2026, paper 13Multiple choice1 mark

  Chlorine gas reacts with hot dilute aqueous sodium hydroxide as shown. $$u{\text{Cl}}_2+v{\text{OH}}^{-}\to w{\text{Cl}}^{-}+y{\text{ClO}}_3^{-}+z{\text{H}}_2\text{O}$$ What is the simplest ratio of $w:y$ in the balanced equation?

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• Question 25Oct/Nov 2023, paper 12Multiple choice1 mark

  When concentrated sulfuric acid is added to solid sodium chloride, $\text{HCl}$ is formed but not ${\text{Cl}}_2$. When concentrated sulfuric acid is added to solid sodium iodide, ${\text{I}}_2$ is formed. Which statement explains these observations?

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• Question 22May/June 2026, paper 13Multiple choice1 mark

  Concentrated sulfuric acid is added to $\text{KX(s)}$, where X is Br, Cl or I. The element sulfur and the halogen molecule, ${\text{X}}_2$, are two of the products made in this reaction. What is the colour of ${\text{X}}_2$ in the gaseous state?

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• Question 18May/June 2025, paper 11Multiple choice1 mark

  Three statements about the halogens, chlorine, bromine and iodine and their compounds are listed. 1 The halogen with the highest boiling point has atoms which form the strongest bond to hydrogen.

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• Question 3May/June 2026, paper 21Structured10 marks

  Separate samples of $\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{l}$, $\mathrm{N}\mathrm{a}\mathrm{B}\mathrm{r}$ and $\mathrm{N}\mathrm{a}\mathrm{I}$ each react with concentrated ${\mathrm{H}}_2{\mathrm{S}\mathrm{O}}_4$. Table 3.1 shows the observations for each reaction.

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• Question 19May/June 2025, paper 11Multiple choice1 mark

  Which reagent or reagents and conditions will oxidise chlorine, ${\text{Cl}}_2$, into a compound containing chlorine in the +5 oxidation state?

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• Question 3May/June 2026, paper 22Structured8 marks

  Separate samples of $\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{l}$ and $\mathrm{N}\mathrm{a}\mathrm{B}\mathrm{r}$ are reacted with concentrated ${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$. Table 3.1 shows the observations for each reaction. Write an equation for reaction 1.

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• Question 17May/June 2025, paper 12Multiple choice1 mark

  Why do the halogens become less volatile as Group 17 is descended?

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• Question 2Oct/Nov 2024, paper 21Structured13 marks

  Chlorine is one of the elements in Group 17 of the Periodic Table. Describe the colours of the Group 17 elements, chlorine to iodine, at room temperature.

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• Question 1May/June 2026, paper 23Structured12 marks

  The chlorides of Period 3 elements show different physical and chemical properties.

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• Question 20May/June 2025, paper 12Multiple choice1 markHas a diagram

  Sodium bromide is warmed with concentrated sulfuric acid. Which row describes the change in the oxidation number of the sulfur and the role of the bromide ions in the reaction?

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