Answer :

1-(c), 2-(a), 3-(d)


Explanation:


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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