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Moisten the inside of a test-tube with water, sprinkle into it a spatula measure of iron
filings and rotate it horizontally so that the filings spread and adhere to the walls.
Alternatively, push a small plug of moistened iron wool to the bottom of the tube. Invert
the test-tube in a beaker about one third full of water. Use the beaker lip to support the
tube. The water levels inside and outside the tube should be the same and the level should
be marked on the tube. Leave the tube in this position for a few days. The iron will rust and
the water level will rise up inside the tube, finally becoming steady. Again add water to the
beaker until the levels inside and outside the tube are the same and mark the new level. It
will be seen that one fifth of the air volume has been used up, suggesting that oxygen has
been used up in the rusting of iron. The residual gas does not support combustion of a
lighted splint.
sharon kalunda answered the question on April 12, 2019 at 07:50
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