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Hydrogen — CHEMISTRY STD 8 — Question

ICSE BoardEnglish MediumSTD 8CHEMISTRYHydrogen1 Mark
Question
Give reason for the following : Though hydrogen is lighter than air it cannot be collected by downward displacement of air.
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Answer

Since hydrogen is lighter than air. it is possible to collect the gas by downward displacement of air. But it is not safe to do so since a mixture of hydrogen and air can lead to an explosion.

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