Question

How can we say that milk is pure?
What is meant by solute and give one example.

Answer 1

In general terms, we consider milk to be pure when it has very less water content. But otherwise, chemically milk consists of several chemical components such as water, carbohydrates, proteins etc.
Usually, a solute is a solid that is dissolved into a liquid. The minor component in a solution is called solute that gets dissolved in a solvent.
Example: When we prepare a solution of salt and water, salt is the solute that gets dissolved in water that is a solvent.