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Explanation:
1.Pure substances are substances that are made up of only one kind of particles and has a fixed or constant structure.
Pure substances are further classified as elements and compounds.
2.Pure substances are generally made up of only a single kind of atom or particle, has a definite structure, constant chemical composition and have a fixed boiling and melting poin-ts.
Also, pure substances are very much homogeneous in mixture, they are often chemical elements or compounds.
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