How can the percentage of oxygen in the air be found using copper?
Answer and explanation
Correct answer: B. Heat copper in a fixed volume of air and measure the fall in volume
- Step 1: Copper reacts with oxygen to form copper oxide. Step 2. The volume fall is the oxygen removed. Answer: Heat copper in a fixed volume of air and measure the fall in volume. Why not the others: The others cannot give the fraction of oxygen in air.
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