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Question

Hydrogen chloride gas is collected by the ___ displacement of air.

A
fractional
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B
sideways
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C
upward
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D
downward
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Solution

The correct option is C upward
When NaCl (common salt) is reacted with sulphuric acid, HCl gas is produced which is collected in the gas jar by upward displacement of air. HCl gas is collected by the upward displacement of air as it is heavier than air and not water.

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