Multiple choice

A lemon is sour because of

  1. citric acid

  2. oxalic acid

  3. acetic acid

  4. None of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lemons contain citric acid (C6H8O7), which gives them their characteristic sour taste. Citric acid is a natural preservative found in citrus fruits. Oxalic acid is in spinach (causes metallic taste), acetic acid is in vinegar. Citric acid is the correct answer.