Essential Chemistry for IGCSE - Making And Identifying Salts (Section 5 - No. 29)
How can you tell if hydrogen gas is present in a test tube?
It relights a glowing splint.
It turns limewater milky.
It makes a "pop" sound when a lit splint is placed at the mouth of the tube.
It has a choking smell.
Explanation
Hydrogen produces a characteristic 'pop' sound when ignited.
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