Question

how to test presence of hydrogen gas
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Answer 1

$\huge \mathfrak\pink{Answer}$

A splint is lit and held near the opening of the tube, then the stopper is removed to expose the splint to the gas. If the gas is flammable, the mixture ignites. This test is most commonly used to identify hydrogen, which extinguishes with a distinctive 'squeaky pop' sound.

Answer 2

Answer:

if we take burning candle near where hydrogen gas evolved, popping sound is produce which determines the presence of hydrogen gas.

Explanation: