What chemical property is shown when hydrogen maeks a slpint ignite?

Answer 1

I think you mean oxygen. However, hydrogen itself might ignite if heated enough by the splint. The chemical property is, anyway, either carbon or hydrogen's affinity with oxygen.

Answer 2

The chemical property being shown in this scenario is the flammability of hydrogen gas. Hydrogen is highly flammable and can ignite easily when exposed to a spark or flame.