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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
A compound is a substance consisting of two or more elements combined chemically in a fixed proportion by mass.
Chlorine gas, iron, aluminium, iodine, carbon and sulphur powder are not compounds.
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