Question 9
Food Substances and EnzymesA mixture of mercurous and mercuric nitrates is added to a food substance. A white precipitate is formed which on gentle heating turns red. The food substance is
- A.protein
- B.oil
- C.carbohydrate
- D.fat
- E.fatty acid
Show the answer and explanation
Answer: A (protein)
Explanation
This is Millon's test: a white precipitate that turns red on warming shows that protein is present.