Question

What is the size range of particles in a colloid?

between 100 nm and 1000 nm
more than 1000 nm
between 1 nm and 1000 nm
between 1 nm and 10 nm

Answer 1

"Colloidal: State of subdivision such that the molecules or polymolecular particles dispersed in a medium have at least one dimension between approximately 1 nm and 1 μm, or that in a system discontinuities are found at distances of that order."

Now just convert 1um to the equal amount of nm's.