Question

A colloidal system has particles of which of the following size?

(a) 10^-9 m to 10^-12 m 

(b) 10^-6 m to 10^-9 m

(c) 10^-4 m to 10^-10 m 

(d) 10^-5 m to 10^-7 m

Answer 1

Correct option (b) 10^-6 m to 10^-9 m

Explanation :

Particle size lies in the range of 10^-6 m to 10^-9 m. Particles themselves are invisible even under the most powerful microscope.