10% oleum comprises of 10% free_________________?
Correct answer: C. SO3
- A. SO2
- B. H2SO3
- C. SO3
- D. H2SO4
Explanation
The percentage in oleum denotes free sulfur trioxide dissolved in sulfuric acid, so 10% oleum contains 10% free SO3 by mass. It does not refer to SO2 or additional H2SO4.
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