Which of the following is a pure substance?
Both compound and element
In chemistry a pure substance is matter of a fixed composition made of only one kind of particle throughout.
Elements (e.g. iron, oxygen, gold) are pure substances because they consist of a single type of atom, and compounds (e.g. water, sodium chloride) are pure substances because they have a fixed chemical composition of two or more elements chemically combined in a definite ratio.
A mixture, by contrast, contains two or more substances in variable proportions and can be physically separated, so it is not a pure substance.
Therefore both elements and compounds qualify as pure substances, not just one of them.
Hence, the answer is Both compound and element.
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