Question

In multimolecular colloids sols, atoms or molecules are held together by:
A. H-bonding
B. van der Waals forces
C. Ionic bonding
D. Polar covalent bonding

Answer 1

We know that the colloidal state of matter is the state of matter in which the particle sizes vary from 1nm to 1000nm. In a colloidal system, dispersed phase refers to the substance which is distributed in the dispersion medium in form of colloidal particles. The term dispersion medium refers to the medium in which in the substance is dispersed in the form of colloidal particles

Complete step by step answer:
In colloidal systems, the size of the particles present in dispersed-phase ranges from 1 to 200 nm. Due to their larger size of particles, the colloid systems exhibit Tyndall's effect.
Intermolecular forces are electrostatic in nature and consist of van der Waals forces and hydrogen bonds. Molecules present in liquids combine to other molecules through intermolecular interactions that are weaker than the intramolecular interactions, which link the atoms together within molecules and polyatomic ions. The three main types of intermolecular interactions are,
Dipole-dipole interactions
London dispersion forces
Hydrogen bonds
Ionic Bonding:
1.Ionic bonding is the broad transfer of outermost electrons between atoms. In ionic bonds, we have to know that the metal loses electrons to become a positively charged cation but the nonmetal accepts those electrons to become a negatively charged anion.
2.Hydrogen Bonding:
A chemical bond in which one molecule containing hydrogen atom is attracted to an electronegative atom mainly nitrogen, oxygen, or fluorine atom, generally of another molecule is known as hydrogen bonding.
3.Polar covalent bonding:
If the electronegativity difference between the two atoms is $0.5 - 1.9$ units then the type of bond is polar covalent and bonding is called polar covalent bonding.
4.Van der Waals forces:
We can say van der Waals forces' is a common term that is used to describe the attraction of intermolecular forces between molecules. There are two types: weak London Dispersion Forces and stronger dipole-dipole forces.
We can say multimolecular colloids are formed when a large number of atoms or small molecules whose diameters are less than 1nm of a substance join together in a dispersion medium to form aggregates containing size in the colloidal range.
The atoms (or) molecules comprising the dispersed particles in multimolecular colloids are held by Vander Waals’ forces.

So, the correct answer is Option B .

Note:
We have to know some of the examples of multicellular colloids, the gold sol, sulphur sol etc. A gold sol has particles of various sizes that could contain many atoms of gold. Likewise, sulphur sol contains particles having about a thousand of S8 molecules.