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Sulphur dioxide is added to must and wine chiefly to

  • A.Raise the pH of the must towards neutrality
  • B.Increase the colour extracted from the grape skins
  • C.Suppress spoilage organisms and prevent oxidation
  • D.Provide additional sugar for the fermenting yeast

Answer: C

It acts both as an antimicrobial, selecting for the relatively resistant Saccharomyces, and as an antioxidant that protects colour and aroma. It is the standard means of preventing and controlling spoilage in winemaking.

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