O2 is denser than air and so, it is collected over:
H2O
Hg
kerosene oil
spirit
A
H2O
B
spirit
C
kerosene oil
D
Hg
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Solution
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O2 is collected over water. The oxygen gas is bubbled through a water into an upturned gas jar filled with water. The bubbles of gas collect in the top of the gas jar and push the water out of the bottom. If enough oxygen is produced then it can completely replace the water. A glass lid is then slid under the gas jar, which is then removed from the water and turned the right way up.
The oxygen is collected over water because it does not dissolve easily in water.
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