Choose the correct statement:

Hydrogen gas is collected by downward displacement of water.

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Hydrogen gas is collected by downward displacement of air.

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Hydrogen gas is collected by upward displacement of water.

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Hydrogen gas is collected by upward displacement of air.

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Solution

The correct option is A Hydrogen gas is collected by downward displacement of water.
Hydrogen gas is collected by downward displacement of water because:

Hydrogen is insoluble in water

Hydrogen forms an explosive mixture with air.

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Ammonia gas is collected in an inverted gas jar by the __(upward/downward) displacement of air.

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