The process of settling down of colloidal particles by adding an electrolyte is called:
coagulation
Colloidal particles carry a like charge, so they repel each other and stay dispersed.
Adding an electrolyte supplies oppositely charged ions that neutralise this charge; the particles then come together, grow and settle down. This is coagulation (flocculation), e.g. alum settling mud in water.
Dialysis removes dissolved ions through a membrane, emulsification disperses one liquid in another, and peptisation is the reverse process, converting a precipitate into a colloid with an electrolyte.
Hence, the answer is coagulation.
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Statement II : When a catalyst is in the powdered form, its surface area becomes highestOn adding some detergent to water, the surface tension
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