How do you check that it's a hydrogen gas?

Answer 1

if an experiment is done in a test tube and hydrogen gas is given off if a lit splint is placed inside the test tube there will be a pop.

Answer 2

To check if a gas is hydrogen, you can perform the "squeaky pop" test. Collect a small sample of the gas in a test tube and ignite it with a flame; if it produces a squeaky pop sound, it is likely hydrogen gas. Additionally, you can use a flame test in a controlled laboratory setting to see if the gas burns with a pale blue flame, characteristic of hydrogen.