Oleum produces fumes of_____________________?
Correct answer: C. SO3
- A. SO2
- B. H2SO4
- C. SO3
- D. SO2 + H2SO4
Explanation
Oleum is sulfuric acid containing dissolved sulfur trioxide, so it releases SO3 fumes when exposed to air. The visible fumes are therefore not primarily SO2 or H2SO4 vapour.
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