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Which of the following materials fall into the category of “pure substance”?




(d)Hydrochloric acid

(e)Calcium oxide





Answer :

Pure substances : Iron, Ice, Hydrochloric acid, Calcium oxide, Mercury

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. An element is a substance that consists of only one type or kind of atom. A compound is a material formed by chemically bonding two or more chemical elements.

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