Which is the most efficient absorbent for SO3 out of the following ?
Correct answer: D. 98% H2SO4
- A. 20% oleum
- B. 65% oleum
- C. 78% H2SO4
- D. 98% H2SO4
Explanation
About 98% sulfuric acid gives the best SO3 absorption because it has low water content without the excessive free SO3 present in oleum. Water would form an acid mist, while oleum is mainly used when producing stronger acid.
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