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Coagulation takes place when sodium chlo...

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

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When NaCI solution is added to the colloidal solution of hydrated ferric oxide coagulation takes place (precipitation formed).
`to` 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.
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