Answer:
The colloidal particles are smaller and not heavy. They
always remain in a state of zig-zag motion, called Brownian movement, which
counters the force of gravity acting on colloidal particles and hence, helps in
providing stability to colloidal sols by not allowing them to settle down.
Apart from this, colloidal particles are charged and repel each other.
This fact also do not the particles of colloidal solution
to settle down. Whereas particles of suspension are larger, heavy and have less
movement, thus settle down due to gravity.
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