Discussion
Which one of the following gases burns with pop sound?
Answer: B
The gas that burns with a pop sound is hydrogen.
When a burning splinter is brought near a test tube of hydrogen, the hydrogen burns rapidly with oxygen of the air, producing a characteristic 'pop' and forming water. This is the standard laboratory test for hydrogen, for example after a metal reacts with dilute acid.
Oxygen does not burn itself but makes a glowing splinter relight. Nitrogen dioxide and sulphur dioxide do not burn with a pop.
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