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6 marksRedox Reactions

CAPE Chemistry Unit 1 · 2013 · Paper 2 · Question 1(b)(ii)

An acidified solution of potassium manganate(VII) is added to hydrogen peroxide, resulting in a redox reaction with effervescence and a colour change.

Write the TWO half equations for the reaction, indicating the changes in oxidation number.

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Other parts of this question

  1. 1(a)(i)Define the term oxidation.[2 marks]
  2. 1(a)(ii)Define the term reduction.[2 marks]
  3. 1(b)(i)State the colour change observed.[1 mark]
  4. 1(b)(iii)State the roles of the two reagents, potassium manganate(VII) and hydrogen peroxide.[2 marks]
  5. 1(c)Describe an experiment, including observations, that can be used to compare the oxidizing ability of the elements chlorine, bromine and iodine.[4 marks]

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