If an unsaturated sugar solution is prepared by mixing 100 grams of sugar with half litre of water, which of the following physical quantities will not change?

Correct answer: (d) volume

Explanation

In an unsaturated solution the solute is below saturation level, so more solute can still dissolve.

Sugar molecules slip into the empty spaces between water molecules instead of occupying fresh space, so volume stays unchanged.

Adding sugar increases the total mass, density and concentration, ruling those out.