SO3 is absorbed using H2SO4 in a____________________?
Correct answer: D. Packed steel tower lined with acid proof bricks
- A. Cast iron packed tower
- B. Stainless steel plate tower
- C. None of these
- D. Packed steel tower lined with acid proof bricks
Explanation
SO₃ absorption in concentrated sulphuric acid is carried out in a packed tower to provide a large gas-liquid contact area. Steel protected with acid-proof brick withstands the highly corrosive acid, unlike unlined cast iron.
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