Question

Coagulation takes place when sodium chloride solution is added to the colloidal solution of ferric hydroxide.

Answer 1

Answer:

Coagulation takes place when sodium chloride solution is added to a colloidal solution of hydrated ferric oxide.

→ The reason is that colloidal particles interact with ions (Na+,Cl-) carrying charge opposite to that present on themselves. This causes neutralisation of charges leading to their coagulation.