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Learning objective

Identify redox reactions by noting the color changes that occur when using acidified aqueous potassium manganate(VII) or aqueous potassium iodide.

Read the explanation, check the common trap, then practise with flashcards and questions.

Exam focus

  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE ChemistryChemical reactionsSupplement content

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Quick explanation

Identify redox reactions by noting the color changes that occur when using acidified aqueous potassium manganate(VII) or aqueous potassium iodide

  • This point belongs to Redox, especially Redox outcomes.
  • You need to be able to identify redox reactions by noting the color changes that occur when using acidified aqueous potassium manganate(VII) or aqueous potassium iodide.
  • The key ideas to know are Identify and Describe.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

IdentifyDescribe

Why it matters

This objective helps connect Redox outcomes to exam-style questions, flashcards, and revision notes for Redox.

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Paper 4 structured question: Redox

Paper 4Theory (Extended)1 marks

Description

Identifying Redox Reactions

When acidified potassium manganate(VII) is added to a solution, it changes color from purple to colorless. In another experiment, potassium iodide is added to a solution, resulting in a brown color.

  1. a

    State the color change observed when potassium manganate(VII) is reduced.

    Aim for approximately 1 distinct marking point.

    [1]
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