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CAIE A-Level Chemistry 11.4.1 Chlorine Reactions with Alkali

Practise balancing chlorine reactions with cold and hot aqueous alkali and interpreting oxidation-number changes.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • write Cl2 + 2OH− → Cl− + ClO− + H2O for chlorine with cold dilute aqueous alkali
  • write 3Cl2 + 6OH− → 5Cl− + ClO3− + 3H2O for chlorine with hot aqueous alkali
  • show chlorine is simultaneously reduced from 0 to −1 and oxidised to +1 or +5

11.4.1—And interpret 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 .

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