Which of the following food items is not generally stored in a container coated with zinc oxide enamel?

Correct option is B

Option (a): Incorrect
• Black pepper is dry and non-reactive; it can be safely stored in zinc oxide enamel-coated containers.
Option (b): Correct
• Vinegar is acidic, and acids react with zinc oxide enamel, causing corrosion and contamination.
• Therefore, vinegar is not stored in such containers.
Option (c): Incorrect
• Cashew nuts are low-acid, low-moisture foods and suitable for storage in enamel-coated containers.
Option (d): Incorrect
• Mustard oil is non-acidic; it does not chemically react with zinc oxide enamel coating.