Which one of the following statements regarding acids is not correct?

Statement 3 is incorrect because tamarind contains tartaric acid, not oxalic acid [3]. Oxalic acid is primarily found in tomatoes and spinach [4]. Regarding the other statements: Hydrochloric acid is indeed a major component of gastric juice secreted by the stomach lining to facilitate digestion and activate enzymes like pepsin [3]. Acetic acid (ethanoic acid) is the primary constituent of vinegar, giving it its characteristic sour taste and odor [1]. Lemon and orange juices contain both citric acid and ascorbic acid (Vitamin C) [3]. While citric acid is the predominant organic acid in citrus fruits, they are also significant dietary sources of ascorbic acid. Therefore, the claim that oxalic acid is found in tamarind paste is the only false statement among the options provided.

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 2: Acids, Bases and Salts > Table 2.3 Some naturally occurring acids > p. 28
2. [3] https://www.ncert.nic.in/textbook/pdf/gesc104.pdf
3. [4] https://sathee.iitk.ac.in/ncert-books/class-07/science/chapter-04-acids-bases-and-salts/
4. [2] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > Activity 5.3 > p. 85