BRAINCAKEExam-style Question 6
Question (4 marks): Sulfur dioxide decolourises bromine water:
SO2 (aq) + Br2 (aq) + 2 H2O (l) → SO42− (aq) + 4 H+ (aq) + 2 Br− (aq)
(a) Use oxidation numbers to show which element is oxidised and which is reduced. (b) Write the half-equation for the sulfur species. (c) Name the ion SO32−, which SO2 forms in alkali.
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Key terms in this lesson
- reducing agent
- A substance that donates electrons to another species, causing it to be reduced, while it is itself oxidised.
- oxidation number
- A number assigned to an atom showing its degree of oxidation, based on the electrons it would gain or lose if all bonds were ionic.
More in Oxidation and Reduction
- Example Question 1
- Example Question 2
- Ionic Equations
- Exam-style Question 1
- Exam-style Question 2
- Exam-style Question 3
- Exam-style Question 4
- Exam-style Question 5
All 14 lessons in Oxidation and Reduction · All Edexcel AS-level Chemistry topics