GATE 2022 ES – Question 23
Which is the most common raw material in flue-gas desulfurization?
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Correct answer: (A) Limestone
Explanation
**Limestone, A**, supplies calcium carbonate to absorb sulfur dioxide in wet scrubbing. Subsequent oxidation can form gypsum. Titanium oxide is a photocatalytic material; Fenton reagent oxidizes contaminants; beryllium oxide is not the conventional bulk desulfurization sorbent.