Which of the following is an adsorbent used for the removal of SO2 from gas/air ?
Correct answer: B. Limestone powder or alkalised alumina
- A. Bog iron
- B. Limestone powder or alkalised alumina
- C. Silica gel
- D. Active carbon
Explanation
Alkalised alumina provides an alkaline surface that adsorbs acidic SO₂, while limestone can also capture it by reaction to form calcium sulphite or sulphate. Bog iron is mainly associated with hydrogen sulphide removal, making option b the intended choice.
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