A pure substance is a substance that consists of only one type of particle, which can be atoms or molecules. Pure substances are either elements or compounds. Mixtures are composed of two or more different substances that are not chemically bonded together. (a) Iron (Fe) is an element, which is a pure substance. (b) Gasoline is a complex mixture of various hydrocarbons. (c) Cow's milk is a mixture of water, fats, proteins, lactose, minerals, etc. (d) Sea water is a solution (a type of mixture) of various salts dissolved in water. Therefore, only Iron is a pure substance among the given options.
Indicate which of the following is a pure substance ? (a) Iron (b) Gasoline (c) Cow's milk (d) Sea Water
Asked in MPSC CS Prelims 2013 · Topic: Physical and Chemical Changes, Solution (Distinction between Physical and Chemical Changes)
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