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Which one of the following statements is false for hydrophilic colloids?

1. They do not require electrolytes for stabillity
2. Their coagulation is reversible
3. Their viscosity is of the order of that of water
4. Their surface tension is usually lower than that of dispersion medium

Correct answer: Their surface tension is usually lower than that of dispersion medium

Solution

Hydrophilic colloids are highly solvated, so they are stable without added electrolytes and their coagulation is often reversible. They usually increase viscosity and lower surface tension, so the statement claiming their surface tension is usually lower than the dispersion medium is the false one.

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