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Three of the following are oxidising bleaches. Which is the odd one out?

  • A.sodium hypochlorite
  • B.sodium chlorite
  • C.sodium dithionite
  • D.hydrogen peroxide

Answer: C

Dithionite is a reducing bleach and works by a quite different mechanism. Reductive bleaching does not destroy the coloured compounds permanently, so the colour can return on exposure to air. Its use is confined to fibres that oxidising bleaches damage.

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