The formation of colloid from suspension is called:1) Peptisation 2) Condensation 3) Sedimentation 4) Fragmentation

The formation of a colloid from a suspension is called Peptisation. This is the process by which a precipitate is converted into a colloidal solution. Here are the steps:

1. A precipitate is first formed by mixing two solutions.
2. Then, a third substance, called the peptizing agent, is added.
3. The peptizing agent adsorbs onto the surface of the precipitate particles.
4. This causes the particles to become charged and repel each other.
5. The repulsion prevents the particles from clumping together and they spread out, forming a colloid.

So, the correct answer is 1) Peptisation.