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B
Downward displacement of water
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C
Upward displacement of water
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D
Upward displacement of air
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Solution
The correct option is D
Upward displacement of air
Pure and dry gases like chlorine, carbon dioxide, which are denser than air are collected by upward displacement because they have a tendency to escape in the upward direction and so can be easily collected. In the manufacturing process of chlorine, the gas is collected by upward displacement of air.