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Which of the following statements about colloids is false?

1. When silver nitrate solution is added to potassium iodide solution, a negatively charged colloidal solution is formed
2. Freezing point of colloidal solution is lower than true solution at same concentration of a solute
3. Colloidal particles can pass through ordinary filter paper
4. When excess of electrolyte is added to colloidal solution, colloidal particle will be precipitated

Correct answer: Freezing point of colloidal solution is lower than true solution at same concentration of a solute

Solution

At the same mass concentration a colloid contains far fewer (much larger) particles than a true solution, so its freezing-point depression is smaller and its freezing point is higher, not lower. Hence the freezing-point statement is the false one.

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