CAIE A-Level Chemistry AS 11.4.2 Explain Questions
Practise explaining how chlorine purifies water by forming HOCl or ClO-, then linking the active species to killing bacteria.
- Syllabus
- 2028–2030
- Course
- Chemistry 9701
- Level
- AS
Exam points
- write the equation for Cl2 reacting with water to form HCl and HOCl
- identify HOCl or ClO− as the active species responsible for killing bacteria
- state water purification or bleach use from chlorate(I) species when context is given
CAIE A-Level Chemistry AS 11.4.2 Explain Questions question 1
[Maximum number: 1]
What is the oxidation state of the chlorine-containing species that kills bacteria in drinking water?
A
-1
B
+1
C
+3
D
+5
B
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