Question

Assertion (A): Brownian motion is observed in colloids.
Reason (R): Brownian motion is caused by unbalanced collisions between the particles of dispersion medium and dispersed phase.

• A. Both A and R are true but R is not the correct explanation of A
• B. Both A and R are true and R is the correct explanation of A
• C. Both A and R are false
• D. A is true but R is false

Answer 1

The correct option is B Both A and R are true and R is the correct explanation of A

Brownian motion is the continuous zig-zag motion of colloidal particles in a fluid due to their collision with other fast moving particles.
It is caused by the unbalanced collisions between the particles of the dispersion medium and the dispersed phase.