Answer: Lemon and tomato both contain citric acid.
Due to the presence of citric acid in the lemon, it is classified as a citrus fruit. Lemon and lime juice are excellent sources of citric acid
Tomatoes have more than ten organic acids in them. The proportions of these acids alter as the tomato ripens. The presence of these acids is determined using UV detectors and a special type of chromatography
Malic acid, pyruvic acid, lactic acid, acetic acid, citric acid, pyroglutamic acid, succinic acid, citramalic acid, fumaric acid and trans-aconitic acid are the ten acids found in tomatoes