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CAIE A-Level Chemistry AS 11.4 The Reactions of Chlorine Questions

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

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 .

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.

Question 3

[Maximum number: 3]

Chlorine is a reactive element. It forms many compounds.

Question (a)

(a)

Write an equation for the reaction of chlorine with water.

[ 1 ]

Question (b)

(b)

Write an equation for the reaction of chlorine with hot NaOH(aq).

[ 1 ]

Question (c)

(c)

Bleach is used as a cleaning product to kill bacteria. It is made by adding compounds like sodium chlorate(I), NaClO, to water.

[ 1 ]

Question (i)

(i)

Identify the formula of the ion present in bleach that kills bacteria.

[ 1 ]
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