In the Contact process of sulphuric acid manufacture, 98% acid cooler is made of_____________________?
Correct answer: B. Cast iron
- A. Stainless steel
- B. Cast iron
- C. Lead lined steel
- D. Rubber lined steel
Explanation
Cast iron has good resistance to concentrated sulphuric acid at about 98% concentration and is therefore used for such coolers. Dilute sulphuric acid is much more corrosive to iron-based materials, so concentration and temperature are important.
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