Which of the following are not compounds?
(a) Chlorine gas
(b) Potassium chloride
(c) Iron
(d) Iron sulphide
(e) Aluminium
(f) Iodine
(g) Carbon
(h) Carbon monoxide
(i) Sulphur powder
These are not compounds:
(a) Chlorine gas
Chlorine gas consists of chlorine molecules. Chlorine is a non-metal.
(c) Iron
Iron is a metal.
(e) Aluminium
Aluminum is a metal
(f) Iodine
Iodine is a non-metal.
(g) Carbon
Carbon is a non-metal.
(i) Sulphur powder
Suphur is a non-metal.
Others are compounds because they are formed by the combination of different elements.