Question 1
Of the components mixed to make a solution, which one is the solvent?
The right answer is the one marked above.
The one present in the larger amount. Amount is the only test. The remaining components are the solutes.
Water is the commonest solvent but nothing in the definition requires it — iodine dissolves in carbon tetrachloride and grease in kerosene, and in each case the solvent is simply whichever there is more of.