Question

The size of colloidal particles is:

• A. <10^-9 m
• B. 10^-9 m
• C. 10^-9 to 10^-6 m
• D. >10^-7 m

Answer 1

The correct option is C

10^-9 to 10^-6 m

Explanation for the correct option:

(C) 10^-9 to 10^-6 m: The diameter of the colloidal particles lies in the range of 10^-9 - 10^-6 m.

• Colloids: A colloid is a heterogeneous mixture in which the size of the particles is so small that the particles cannot be seen with the naked eye.
• Colloids show the Tyndall effect i.e.; when particles scatter a beam of light passing through them and make the path of light visible.
• Examples of colloids: Milk, mist, etc.

Hence, option (C) is correct.