Question

How will you detect the presence of hydrogen peroxide in milk?

• A. When adulterated milk is treated with ferric chloride solution and concentrated sulfuric acid, violet color develops at the junction of two layers.
• B. When adulterated milk is treated with para-phenylenediamine hydrochloric acid, it gives dark blue color.
• C. When adulterated milk is treated with HCl and resorcinol powder and boiled in a water bath, it gives red color.
• D. By measuring lactometer reading.

Hint:

Avoid the use of milk preservatives like hydrogen peroxide due to health concerns and legal restrictions.

Answer 1

The Correct Option is B

Hydrogen peroxide is often added to milk as a preservative or to mask spoilage. Its presence can be detected by adding para-phenylenediamine hydrochloric acid to milk. This reaction produces a distinct dark blue color, confirming the presence of hydrogen peroxide. The test is simple and reliable, making it widely used in detecting adulterants in milk.