Question

hydrogen is a combustable substance oxygen is supporter of combusion then how water is used to distinguish fire.

Answer 1

hey here is ur answer when the elements reacts and form a molecule they lose their identity and observe the new properties.
thus when hydrogen and oxygen react they form water(H2O) and use as a distinguisher of fire.

hope dis help

Answer 2

It is because properties of compound (H2O) are different from properties of its constituting elements i.e. H2 and O2