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4 marksOxidation – Reduction Reactions

CSEC Chemistry · May/June 2010 · Paper 2 · Question 4(a)(i)

A pink solution of aqueous acidified potassium manganate(VII) is decolourised by the addition of ferrous(Fe²⁺) ions. The chemical equation for the reaction is MnO₄⁻(aq) + 5 Fe²⁺(aq) + 8 H⁺(aq) → Mn²⁺(aq) + 5 Fe³⁺(aq) + 4 H₂O.

Identify the oxidizing and reducing agents in the equation, and explain your answer.

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Other parts of this question

  1. 4(a)(ii)Iron(II) oxide reacts with dilute sulphuric acid to give a pale green solution. Write the equation for the reaction between iron(II) oxide and dilute sulphuric…[2 marks]
  2. 4(a)(iii)State whether the reaction in (ii) above is acid-base or redox, and explain your answer.[3 marks]
  3. 4(b)(i)What is meant by 'fermentation,' as it relates to the manufacture of rum?[2 marks]
  4. 4(b)(ii)Write the equation for the fermentation process defined in (i).[2 marks]
  5. 4(b)(iii)Suggest ONE material that could be used to produce wine by fermentation, and give a reason for your suggestion.[2 marks]

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