Question

name the gas which is essential for combustion

Answer 1

Oxygen is must for combustion to take place.
Without oxygen combustion is impossible.
Hope it will help.
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Answer 2

Oxygen is the gas needed for combustion.
If you need you can test it by an experiment.
Keep a candle in a table and close tight with a jar.
you can when there is no enough oxygen the fire goes.


hope it is helpful