Q. Which of the following are natural organic acids present in common foods?

1. Oxalic acid – spinach
2. Tartaric acid – tamarind
3. Malic acid – apples
4. Hydrochloric acid – citrus fruits

Select the correct option from the codes given below:
Answer: 1, 2 and 3
Notes: Spinach contains oxalic acid, tamarind is rich in tartaric acid, and apples contain malic acid, all of which are natural organic acids. Hydrochloric acid is an inorganic acid found in the human stomach, not in citrus fruits; citrus fruits contain citric acid.