Q130 / 200 · MHT CET - Medical 2026 (26 April Shift 1) · Chemistry
Which from following gases when absorbed by concentrated sulphuric acid forms oleum ?
- Correct answerA$\text{SO}_3$
- B$\text{Cl}_2$
- C$\text{N}_2\text{O}$
- D$\text{Br}_2$
Solution
Oleum is fuming sulphuric acid, with the chemical formula $\text{H}_2\text{S}_2\text{O}_7$.
It is formed when sulphur trioxide ($\text{SO}_3$) gas is absorbed in concentrated sulphuric acid ($\text{H}_2\text{SO}_4$).
The chemical reaction is given by:
$\text{H}_2\text{SO}_4 + \text{SO}_3 \rightarrow \text{H}_2\text{S}_2\text{O}_7$
Answer: $\text{SO}_3$
It is formed when sulphur trioxide ($\text{SO}_3$) gas is absorbed in concentrated sulphuric acid ($\text{H}_2\text{SO}_4$).
The chemical reaction is given by:
$\text{H}_2\text{SO}_4 + \text{SO}_3 \rightarrow \text{H}_2\text{S}_2\text{O}_7$
Answer: $\text{SO}_3$
Hence, the correct answer is option: 'A'.