This answer explains how to identify mixtures vs. compounds in the context of substances like sugar, sea water, and air.
Heterogeneous mixtures:
Homogeneous mixtures:
Compounds:
In this question, the substances that are not mixtures are sugar, which is a compound, and sea water is a heterogeneous mixture. Air is a homogeneous mixture as it contains different gases evenly distributed. Therefore, the correct answer is (c) (iii) and (iv).
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