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

hydroxide – Explain.

it is bcoz NaCl  has small size with neutral charge,  which would act as an electrolyte & would lead to coagulation of ferric hydroxide

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NaCl is an electrolyte. it decomposes into Na+ and Cl-. These attack the charged colloidal particles and thus discharge them. Thecolloidal particles then coagulate.

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When NaCl is added to ferric oxide sol, it dissociates to give Na+ and Cl-­ ions. Particles of ferric oxide sol are positively charged. Thus, they get coagulated in the presence of negatively charged Cl- ion
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