Question

Which one is known as 'Oil of vitriol'?

• A. $H_{2}S{O}_3$
• B. $H_{2}S{O}_4$
• C. $H_2{S}_2{O}_7$
• D. none of these

Answer 1

The correct option is B $H_{2}S{O}_4$

Sulfuric acid whose chemical formula is $H_{2}S{O}_4$ is called as "oil of vitriol" by medieval European chemists because it was prepared by roasting "green vitriol" (iron(II) sulfate i.e. $FeS{O}_4$) in an iron container.

Hence option B is correct.