Using iron fillings, describe an experiment that can be conducted to show that oxygen is present in air.
Answer Text: - Moisten a measuring cylinder and sprinkle some iron fillings in the cylinder.- Invert the cylinder in a water trough containing water and note the level of water in the cylinder. - After 2 to 3 days, iron fillings will turn from grey to brown and the water level in the measuring cylinder therefore rises to occupy the space left by oxygen present in air.
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