Question:
Identify the correct molecular formula of 'Oleum' from following.
Identify the correct molecular formula of 'Oleum' from following.
Show Hint
Oleum = \(H_2SO_4 + SO_3\); just add the atoms together.
Updated On: May 14, 2026
- \( \text{H}_2\text{S}_2\text{O}_3 \)
- \( \text{H}_2\text{S}_2\text{O}_7 \)
- \( \text{H}_2\text{S}_2\text{O}_5 \)
- \( \text{H}_2\text{S}_2\text{O}_8 \)
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Concept
Oleum, or pyrosulfuric acid, is formed by dissolving sulfur trioxide in concentrated sulfuric acid.
Step 2: Meaning
It is a key intermediate in the Contact process for manufacturing \(H_2SO_4\).
Step 3: Analysis
Reaction: \(H_2SO_4 + SO_3 \rightarrow H_2S_2O_7\).
Step 4: Conclusion
The molecular formula for Oleum is \(H_2S_2O_7\). Final Answer: (B)
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