Solution : it is a homogeneous mixture of solute and solvent.
Homogeneous mixtures have only single phase.
solvent: which dissolves solute to produce a homogeneous mixture
solute: which dissolves in a solvent to produce a homogeneous mixture
Homogeneous mixture: air, Seawater , Soda water
Heterogeneous mixture: soil , Coal
Final Answer : Hence the correct answer is (b) Seawater (c) Air (e)Soda water