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InterviewSolution
| 1. |
A colloid is formed by adding `FeCl_(3)` in excess of hot water. What will happen if excess sodium chloride is added to this colloid? |
| Answer» Positively charged ions coagulate the negatively charged sol and negatively charged ion coagulate the positively charged sol. Positively charged sol of hydrated ferric oxide is formed when `FeCl_(3)` is added in excess of hot water. On adding excess of NaCl to this sol, negatively charged `Cl^(-)` ions coagulate the positively charged sol of hydrated ferric oxide. | |