Q. 6

Which of the following materials fall in the category of a “pure substance”?
A. Ice, milk and iron

B. CaO, CO2 and NaCl

C. Brick, mercury and wood

D. Iron, CaO and air

Answer :

Pure substances are those in which all the constituent particles present in them are the same in their chemical nature.

Elements and compounds are examples of pure substances. CaO, CO2, NaCl are examples of compounds. Air, milk, brick and wood fall under impure substances.

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