NEET Chemistry: Chemistry - Acids questions with solutions

Q1. Oleum is:

1. castor oil
2. oil of vitriol
3. fuming sulphuric acid
4. none of these

Answer: fuming sulphuric acid

Oleum is fuming sulfuric acid, a mixture of sulfuric acid and dissolved sulfur trioxide. It is called “fuming” because it releases SO3 fumes on exposure to air.