In multimolecular colloidal sols, atoms or molecules are held together by :

H - bonding

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van der Waals forces

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ionic bonding

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polar covalent bonding

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Solution

The correct option is D van der Waals forces
When a large number of atoms or small molecules (having diameters of less than $1$ nm) of a substance combine together in a dispersion medium to form aggregates having size in the colloidal range, the colloidal solutions thus formed are called multimolecular colloids.
The species (atoms or molecules) constituting the dispersed particles in multimolecular colloids are held together by van der Waals forces.

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