ConceptConceptDocsDocuments

CAIE A-Level Chemistry 11.4 Reactions of Chlorine

Practise chlorine disproportionation in alkali and the equations and active species involved in water purification.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • distinguish chloride plus chlorate(I) in cold dilute alkali from chloride plus chlorate(V) in hot alkali
  • track chlorine from oxidation number 0 to both −1 and +1 or +5 to demonstrate disproportionation
  • write chlorine hydrolysis in water and identify HClO or ClO− as the species that kills bacteria

Covered syllabus points

11.4.1—And interpret11.4.2—Explain

11.4 The reactions of chlorine question 1

[Maximum number: 1]

Chlorine is one of the elements in Group 17 of the Periodic Table.

CHCl3\mathrm{CHCl}_{3} is another halogenoalkane. CHCl3\mathrm{CHCl}_{3} forms when propanone reacts with NaClO .

NaC 1 O is made from chlorine in a disproportionation reaction.

Identify a reagent and conditions that can be used to convert chlorine to NaC 1 O .

11.4 The reactions of chlorine question 2

[Maximum number: 2]

The halogens chlorine, bromine and iodine show trends in chemical and physical properties down the group.

Table 3.1 shows some properties of chlorine, bromine and iodine.

Table 3.1

Table 3.1

Explain, with the use of an equation, how chlorine, Cl2\mathrm{Cl}_{2}, is used in water purification. State the role of the active species produced.

All question bank results loaded