White gold is actually an alloy of three metals: 85% gold, 10% nickel and 5% zinc. based on these concentrations, which metal is considered to be the solvent?

Gold

A solvent is a component of the solution which has ability to dissolve the other component of solution that is solute. The solvent is always present in higher or greater amount in the solution, so as to allow different solute components to dissolve within it. In white gold the concentration of gold is 85%, which is highest than all other components like nickel and zinc. Therefore, gold can be considered as solvent.