Hydrogen gas is collected by _______.

the downward displacement of air

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the upward displacement of water

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the upward displacement of air

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the downward displacement of water

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Solution

The correct option is D the downward displacement of water
Hydrogen is lighter than air, so it is possible to collect the gas by the downward displacement of air. But it is not safe to do so since a mixture of hydrogen and air can lead to an explosion. Hydrogen gas is collected by the downward displacement of water.

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