1. Acetic acid
  2. Formic acid
  3. Citric acid
  4. Tartaric acid
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Option 3 : Citric acid

  • Lemon juice is a very acidic fruit juice with an average pH of 2.3.
  • Citric acid is the predominant organic acid in it, with smaller but significant amounts of ascorbic acid (vitamin C).
  • The juice also contains malic acid.
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