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Cambridge IGCSE Chemistry practice

Paper 4 structured question: Redox

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Redox

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Paper 4Theory (Extended)1 marks

Redox reactions can be identified using specific reagents that show color changes.

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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Paper 4 structured question: Redox

Paper 4Theory (Extended)2 marks

Description

Color Changes in Redox Reactions

In a redox reaction involving potassium iodide, the solution turns brown, indicating the formation of iodine. In another reaction, the addition of acidified potassium manganate(VII) leads to a color change from purple to colorless.

  1. a

    Describe the significance of the color change observed with potassium iodide in redox reactions.

    Aim for approximately 2 distinct marking points.

    [2]