Choose solvent solute in the following cases
(i) Brine solution
(ii) Crystalline copper sulphate
(iii) Aq. Solution of copper sulphate

Explanation

(i) is aq. Solution of NaCl here water is solvent as it is larger in % (w/w) and also final solution is in the liquid state that is the physical state of water.
(ii) Crystalline copper is same as of solvent
(iii) In an aqueous solution solvent is always water.
(iv) 1 mole ethanol=46 g, 1 mole water =18 g
`rArr` Solvent is ethanol