In flue gas analysis by Orsat's apparatus, oxygen is absorbed by____________________?
Correct answer: C. Alkaline pyrogallol solution
- A. Potassium hydroxide
- B. Cuprous chloride
- C. Alkaline pyrogallol solution
- D. None of these
Explanation
In an Orsat analysis, alkaline pyrogallol selectively absorbs oxygen, while potassium hydroxide absorbs carbon dioxide and cuprous chloride absorbs carbon monoxide. Thus oxygen is measured using alkaline pyrogallol solution.
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