Question

Which of the following materials fall in the category of a pure substance (a) milk ( b) iron​

Answer 1

b. iron

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Answer 2

Ice, iron, hydrochloric acid, calcium oxide, mercury are pure substances as they have definite composition. Milk is a colloid and acts as a heterogeneous mixture; hence is not a pure substance. Brick and air are made up of more than one substance; hence they also don't fall into pure substances.

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