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CAIE A-Level Chemistry 11.3 Reactions of Halide Ions

Practise halide reducing-strength trends, silver-ion tests and reactions with concentrated sulfuric acid.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • rank halide reducing strength and connect it to displacement or concentrated-acid redox
  • identify AgCl, AgBr and AgI from precipitate colour and their different behaviour with aqueous ammonia
  • write acid–base and redox equations for solid halides reacting with concentrated sulfuric acid

Covered syllabus points

11.3.1—Reactivity of halide ions as reducing agents11.3.2—Reactions of halide ions

11.3 Some reactions of the halide ions question 1

[Maximum number: 2]

The chlorides of some of the Period 3 elements are shown in Table 2.1.

Table 2.1

Table 2.1

An excess of Cl−(aq)\mathrm{Cl}^{-}(\mathrm{aq}) is added to 1 cm31 \mathrm{~cm}^{3} of Br2(aq)\mathrm{Br}_{2}(\mathrm{aq}).

Describe what is observed. Explain your answer.

11.3 Some reactions of the halide ions question 2

[Maximum number: 2]

The Group 17 elements are oxidising agents.

Table 1.2 shows some information about reactions of NaCl\ce{NaCl}, NaBr\ce{NaBr} and NaI\ce{NaI}.

Table 1.2

Table 1.2

Suggest an identity for the species that produces each observation in the reaction of NaI with concentrated H2SO4\mathrm{H}_{2} \mathrm{SO}_{4}.
black solid
yellow solid
effervescence

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