The correct option is (c).
Explanation
Naturally occurring acids are organic acids found in various plant and animal sources. Unlike mineral acids, these are typically weak acids found in everyday food items.
Statement-wise Analysis:
- Statement 1 is Incorrect: Vinegar is primarily a dilute solution of acetic acid (ethanoic acid). Lactic acid is the acid present in sour milk or curd.
- Statement 2 is Correct: Oxalic acid is naturally found in spinach. It is also present in tomatoes.
- Statement 3 is Correct: Ascorbic acid is the chemical name for Vitamin C. It is abundantly found in citrus fruits (such as lemons and oranges) and Indian gooseberry (amla).
Key Takeaway:
Important natural acid sources include: Vinegar (Acetic acid), Curd (Lactic acid), Citrus fruits (Citric acid), Spinach/Tomatoes (Oxalic acid), Tamarind (Tartaric acid), and Ant stings (Methanoic/Formic acid).