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Which of the following is not used as a food preservative?

  • A.Salt
  • B.Sugar
  • C.Vinegar
  • D.Methane

Answer: D

Correct answer: Methane

Methane is a gas and preserves nothing. Salt and sugar preserve by drawing water out of microbial cells osmotically, and vinegar by acidity - all three work by making the food a place where microorganisms cannot grow.

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