Group 17: past paper questions
Real questions on group 17
The newest 20 of 102 written questions, plus 58 multiple-choice. Open one to see it on the real paper.
- 9701/22 · October/November 2025 · Q2c[4]
Table 2.1 gives some information about some Period 3 chlorides. Row B refers to the pH of the solution that forms when the Period 3 chloride is added to water. Table 2.1 formula of Period 3 chloride NaCl MgCl 2 Al Cl 3 A oxidation number of element bonded to Cl B pH of solution C bonding ionic D structure giant SiCl 4...
See it on the paper → - 9701/22 · October/November 2025 · Q2d(i)[1]
Write an equation for the formation of Al Cl 3 from its elements.
See it on the paper → - 9701/43 · October/November 2025 · Q8c[3]
Separate samples of C 6 H 5 Br and C 6 H 5 CH 2 Br are added to warm AgNO 3 (aq). State the expected observations, if any. Explain your answer. C 6 H 5 Br with AgNO 3 (aq) C 6 H 5 CH 2 Br with AgNO 3 (aq) explanation
See it on the paper → - 9701/52 · October/November 2025 · Q1c(iii)[1]
Identify the precipitate in flask A in step 5.
See it on the paper → - 9701/23 · May/June 2025 · Q6a(ii)[1]
Describe how Cl 2 is used to produce HOCl.
See it on the paper → - 9701/23 · May/June 2025 · Q6a(iii)[1]
State one use for HOCl.
See it on the paper → - 9701/42 · May/June 2025 · Q6d(i)[1]
Suggest reagents and conditions for reaction 1. (i)
See it on the paper → - 9701/42 · May/June 2025 · Q6d(ii)[1]
Name the type of reaction for reaction 1.
See it on the paper → - 9701/42 · May/June 2025 · Q9c(ii)[2]
State the reagents and conditions for steps 1 and 2 in Fig. 9.3. step
See it on the paper → - 9701/43 · May/June 2025 · Q5b(ii)[1]
Write an equation for the reaction taking place. (ii)
See it on the paper → - 9701/43 · May/June 2025 · Q5c(i)[1]
An excess of NH 3 (aq) is added to CuSO 4 (aq). Describe any further observations made. (c) (i)
See it on the paper → - 9701/43 · May/June 2025 · Q5c(ii)[1]
Write an equation for the reaction taking place.
See it on the paper → - 9701/43 · May/June 2025 · Q5c(iii)[1]
State the name for the type of reaction taking place.
See it on the paper → - 9701/43 · May/June 2025 · Q10b[4]
The three acids, propanoic acid, methanoic acid and ethanedioic acid, can be distinguished using a combination of two chemical tests. Neither testing reagent is an acid–base indicator. Identify two suitable testing reagents and complete Table 10.1 to show the observations from each test. reagent reagent Table 10.1 obse...
See it on the paper → - 9701/22 · February/March 2025 · Q3c(i)[1]
Identify the sodium halide that reacts with concentrated H 2 SO 4 to form H 2 S.
See it on the paper → - 9701/22 · February/March 2025 · Q3c(ii)[1]
Identify the sodium halide that only undergoes a Brønsted–Lowry acid–base reaction with concentrated H 2 SO 4 .
See it on the paper → - 9701/21 · October/November 2024 · Q2a(i)[1]
Describe the colours of the Group 17 elements, chlorine to iodine, at room temperature.
See it on the paper → - 9701/21 · October/November 2024 · Q2a(ii)[1]
Describe the relative reactivity of the elements chlorine to iodine as oxidising agents.
See it on the paper → - 9701/21 · October/November 2024 · Q2a(iii)[1]
State what is observed when chlorine reacts with hydrogen.
See it on the paper → - 9701/21 · October/November 2024 · Q2a(iv)[1]
Explain why the thermal stability of the hydrogen halides decreases down the group.
See it on the paper →
What examiners said
Observations were required for three tests carried out on separate samples of NaCl(aq). When Br2(aq) is added to a sample no reaction occurs, and the colourless solution of NaCl(aq) turns orange (because of the added Br2). Most answers stated that the observation from the addition of concentrated H2SO4 to NaCl(aq) is misty/steamy fumes, not recognising that the NaCl is in aqueous solution (and n...
— Examiner report, October/November 2023, 9701/21 Q1(c) (Cambridge)
When barium oxide is added to water the observation is that the white solid dissolves/disappears to form a colourless solution. A common error was that there was bubbling/effervescence seen.
— Examiner report, October/November 2023, 9701/21 Q2(a)(ii) (Cambridge)
This question was answered well. Common errors included [Co(NH3)4(H2O)2]2+, [CoCl4]2+ and [CoCl4]–.
— Examiner report, October/November 2023, 9701/43 Q4(a)(i) (Cambridge)
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