The "Stern layer" is associated with:
The outer layer of co-ions around a colloidal particle
The inner layer of adsorbed ions of opposite charge around a colloidal particle
The layer of solvent molecules surrounding a colloidal particle
The gel layer formed during the coagulation process
The Stern layer is the region immediately adjacent to the colloidal particle, containing adsorbed counterions that are attracted to the surface charge.
Hence option 2 is correct.
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