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Sodium silicate is added to a peroxide bleach bath as

  • A.a wetting agent for the bath
  • B.an optical brightening agent
  • C.a stabiliser controlling decomposition
  • D.the only source of the alkalinity present

Answer: C

It moderates the release of active oxygen and also sequesters some metal ions. Its drawback is silicate deposits on machinery and fabric, which is why organic stabilisers have been developed. Silicate scale is a maintenance burden.

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