Question

give the test for detection O gas

Answer 1

heyy...

here's your answer looking for________
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Oxygen supports combustion so a good method of testing for oxygen is to take a glowing splint and place it in a sample of gas, if it re-ignites the gas is oxygen.

This is a simple but effective test for oxygen. There are sometimes confusions as the splint can create a pop very slightly on re-ignition, which sometimes is mistaken for hydrogen. A hydrogen pop is much more violent, sometimes enough to completely extinguish the splint.

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Answer 2

The simplest method I know is the ember test.
Get a match ,light it,blow the flame,bring the ember close to the sample.
If the ember reignites , It's oxygen but if there's a small explosion , it's hydrogen.
HOPE IT HELPS