Those would be the "oxides" of the elements burned.
Chloride itself is not a substance. It is the ion formed by the element chlorine. Chlorine can react with oxygen but in most of its reactions it does not burn but rather causes other substances to "burn" much in the manner that oxygen does.
oxygen
when a substance is burned it turns into ash.
oxygen
This is oxygen. Burning is combination with oxygen.
Hydrogen and oxygen are already elements. You don't get elements as a product. You get water, which is a compound.
Oxygen can not burn in air.
Oxygen
mageneium oxide
Hydrogen is a colorless gas that burns with oxygen. If substances will burn in air, those same substance will burn better in oxygen.
A combustible substance will burn easily when on fire, A flammable substance can easily catch fire.
Any substance that burns in air is likely to burn faster in pure oxygen, if all other conditions are equal.