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Hydrogen peroxide bleaching of cotton is carried out under

  • A.alkaline conditions with caustic soda
  • B.strongly acidic conditions throughout
  • C.entirely neutral conditions only
  • D.conditions of a pH below four

Answer: A

The perhydroxyl ion is the active species and its concentration rises with pH. Too high a pH causes rapid decomposition, so the alkalinity is controlled rather than simply maximised. Temperature and time complete the recipe.

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