In contact process, SO3 is absorbed in 97% H2SO4 and not in water, because___________________?
Correct answer: B. Water forms an acid mist, which is difficult to absorb
- A. SO3 gas is sparingly soluble in water
- B. Water forms an acid mist, which is difficult to absorb
- C. The purity of acid is affected
- D. Scale formation in the absorber is to be avoided
Explanation
Absorbing SO₃ directly in water produces a fine sulphuric-acid mist that is difficult to collect and causes loss of product. Concentrated sulphuric acid absorbs SO₃ smoothly and forms oleum, which is then diluted to the desired strength.
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