1-(c), 2-(a), 3-(d)
Sodium chloride is a compound formed by the elements sodium and chlorine.
Compounds belonging to the class of pure substances.
Milk is a colloid and colloids are heterogeneous mixtures which fall under the category of impure substances.
Air is a homogenous mixture consisting of various gases mixed uniformly such that one cannot distinguish the components of the mixture with naked eye or microscope.
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