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A colloid is formed by adding \text {FeCl}_{3} in excess of hot water. What will happen if excess sodium chloride is added to this colloid?
 

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On adding excess sodium chloride to a colloid formed by adding \text {FeCl}_{3} in excess of hot water, coagulation occurs. It happens because the chloride ions from sodium chloride neutralizes the positively charged hydrated ferric oxide solution.

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