Quelpr
4 marksOxidation – Reduction Reactions

CSEC Chemistry · January 2016 · Paper 2 · Question 2(e)

Hydrogen peroxide is an alternative to chlorine bleach, and its bleaching action is a redox reaction: 2H₂O₂(aq) → 2H₂O(l) + O₂(g).

During one stage of the reaction, H₂O₂(aq) is converted to H₂O(l). Use the changes in oxidation number to determine whether this is an oxidation or reduction process.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 2(a)State ONE use of bleach in the laundering of clothing.[1 mark]
  2. 2(b)(i)Define, in terms of oxidation state, the term 'oxidizing agent'.[1 mark]
  3. 2(b)(ii)Define, in terms of oxidation state, the term 'oxidation'.[1 mark]
  4. 2(c)Deduce the oxidation number of Cl in the formula, NaClO.[3 marks]
  5. 2(d)(i)What is the change in oxidation number of Cl for the process?[2 marks]
  6. 2(d)(ii)Is this an oxidation or reduction process?[1 mark]
  7. 2(d)(iii)Describe a simple laboratory test for chlorine gas.[2 marks]

More practice: the rest of this paper · more Oxidation – Reduction Reactions questions · all CSEC Chemistry past papers