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Chemistry · Oct / Nov 2018 · Paper 11 · Question 19

5070Redox

Many reactions involve oxidation and reduction. Which statement is correct?

  1. AAcidified manganate(VII) ions change colour from colourless to purple when reduced.
  2. BAll reactions that involve oxidation also involve reduction.
  3. CDuring a reaction, oxidising agents lose electrons.
  4. DReduction is the loss of hydrogen from a compound.

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Correct answer: B. All reactions that involve oxidation also involve reduction.

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