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The gas evolved during the early stage of a sauerkraut fermentation is chiefly

  • A.Carbon dioxide
  • B.Hydrogen sulphide
  • C.Ammonia
  • D.Methane

Answer: A

Heterofermentative lactic acid bacteria release carbon dioxide as they ferment sugar, and its evolution is a sign the process has started properly. Hydrogen sulphide and ammonia signal spoilage, and methane has no part in the process.

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