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During dialysis

1. only solvent molecules can diffuse
2. solvent molecules, ions and colloidal particles can diffuse
3. all kinds of particles can diffuse through the semi-permeable membrane
4. solvent molecules and ions can diffuse

Correct answer: solvent molecules and ions can diffuse

Solution

During dialysis, solvent molecules and small ions can pass through the semi-permeable membrane, but larger colloidal particles cannot.

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