Question

When the mustard oil is mixed with nitric acid, it gives a .......... that indicates adulteration of mustard oil.

• A. Reddish brown ring appearance
• B. Purple ring appearance
• C. Reddish green ring appearance
• D. None of the above

Answer 1

The correct option is A Reddish brown ring appearance

Adulteration is a process of mixing undesirable and inferior materials in food. The material or substance which is added to food is called as adulterants. Mustard oil is mostly adulterated with argemone oil. To detect the argemone oil in mustard oil, concentrated nitric acid is used. If the red to reddish brown colour appears in the acid layer, then it is adulterated with argemone oil.

Thus, the correct answer is option A.