Question

Oleum is

• A. castor oil
• B. oil of vitriol
• C. $fuming \, H_2SO_4$
• D. None of these

Answer 1

Answer: (C)

$fuming \, H_2SO_4$

Answer 2

Disulphuric acid $(H_2S_2O_7)$ is called oleum or fuming sulphuric acid. It is strongest oxidising agent and more powerful dehydrating agent.