Question

supporter of combustion apart from oxygen

Answer 1

there is no other supporter of combustion apart from oxygen.there are many combustible gases which can burn only if oxygen is present.

Answer 2

Hydrogen burns in Chlorine to form HCl. Thus, Chlorine gas supports the burning of Hydrogen.                                                                                                          P.S- It is also a redox reaction.There is reduction and oxidation going on