BRAINCAKEExam-style Question 5
Question (4 marks): Hydrogen peroxide oxidises iodide ions in acidic solution:
H2O2 (aq) + 2 H+ (aq) + 2 I− (aq) → I2 (aq) + 2 H2O (l)
(a) Give the oxidation number of oxygen in H2O2 and in H2O. (b) Write the two half-equations. (c) Identify the oxidising agent and explain your answer.
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Key terms in this lesson
- oxidising agent
- A substance that accepts electrons from another species, causing it to be oxidised, while it is itself reduced.
- reducing agent
- A substance that donates electrons to another species, causing it to be reduced, while it is itself oxidised.
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 6
All 14 lessons in Oxidation and Reduction · All Edexcel AS-level Chemistry topics