Question

Which of the following particles do not remain suspended when dissolved in water?

• A. Flour
• B. Chalk powder
• C. Sand
• D. Sugar

Answer 1

The correct option is D Sugar

Out of the given options, flour, chalk powder and sand does not mix with water and they remain suspended in water. Such mixtures are called suspensions. The solute particles in a suspension mixture are of size more than ${10}^{-5}$ cm.
However, sugar dissolves in water and does not remain suspended. Such a mixture is called true solution. It contains solutes of size less than ${10}^{-7}$ cm.