Question

The size of colloidal particle is

• A. $10^{-3}$ to $10^{-9} \,m$
• B. $10^{-9}$ to $10^{-12}\, m$
• C. $10^{-6}$ to $10^{-9} m$
• D. $10^{-12}$ to $10^{-19} m$

Answer 1

Answer: (C)

A system is said to be in colloidal state if particles of one or more components have the same size range $10^{-6}\, m$ to $10^{-9}\, m$. In other words, the colloidal solution is a heterogenous dispersion of solute particles size ranging from $10^{-6}\, m$ into the solvent. Particles are visible only with an ultra microscope.