Which of the following are not compounds?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond
Chlorine gas, Aluminium foil, Graphite, Sulphur powder and diamond are elements.
Air is needed for the combustion (or burning) of fuels. Which component of air actually supports combustion?
Air shows the properties of all the gases present in it. Oxygen present in it supports combustion and hence air is needed for combustion.