# An example of colloidal sol in which the affinity of the sol particles for the medium is due to hydrogen bonding is

1. A

Sulphur in water

2. B

Gold in water

3. C

$\mathrm{Fe}\left(\mathrm{OH}{\right)}_{3}$ in water

4. D

Protein in water

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### Solution:

Protein in water is example of lyophillic colloid solution. In this type of colloidal solution the particles of dispersed phase have a great affinity for the dispersion medium due to H-bonding.

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