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Which of the following statements correctly describes the properties of hydrophilic sols?

1. Due to high affinity between dispersed phase and dispersion medium, hydrophilic sols are more stable and reversible. As they are highly hydrated, viscosity increases and they have a lower surface tension than the dispersion medium.
2. Due to high affinity between dispersed phase and dispersion medium, hydrophobic sols are more stable and reversible. As they are highly hydrated, viscosity decreases and they have a lower surface tension than the dispersion medium.
3. Due to low affinity between dispersed phase and dispersion medium, hydrophilic sols are more stable and reversible. As they are highly hydrated, viscosity decreases and they have a lower surface tension than the dispersion medium.
4. Due to high affinity between dispersed phase and dispersion medium, hydrophilic sols are more stable and irreversible. As they are highly hydrated, viscosity decreases and they have a lower surface tension than the dispersion medium.

Correct answer: Due to high affinity between dispersed phase and dispersion medium, hydrophilic sols are more stable and reversible. As they are highly hydrated, viscosity increases and they have a lower surface tension than the dispersion medium.

Solution

Hydrophilic sols have high affinity between dispersed phase and water, making them stable and reversible (can be redispersed after precipitation). The hydrated particles increase the viscosity (not decrease), and the dissolved organic-like dispersed phase lowers the surface tension below that of water. The original option B in the question contains a typo saying 'decreases' for viscosity - the correct fact is viscosity increases.

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