The correct answer is D. Hydrophilic colloid.
A hydrophilic colloid is a colloid in which the dispersed phase has an affinity for the dispersion medium. This means that the particles of the dispersed phase are attracted to the water molecules in the dispersion medium. This attraction causes the particles to form a stable suspension in the water.
Hydrophilic colloids are formed when a substance that is soluble in water is mixed with water. The molecules of the substance dissolve in the water and form a solution. The solution is then dispersed into small droplets, which are suspended in the water. The droplets are stabilized by the attraction between the water molecules and the molecules of the substance.
Hydrophilic colloids are important in many different applications. They are used in cosmetics, pharmaceuticals, and food products. They are also used in industrial processes, such as papermaking and wastewater treatment.
Extrinsic colloids are colloids in which the dispersed phase is a solid and the dispersion medium is a liquid. The particles of the dispersed phase are large enough to be visible to the naked eye, but they are too small to settle out of the dispersion medium. Extrinsic colloids are stabilized by the presence of an adsorbed layer of ions or molecules on the surface of the particles.
Associated colloids are colloids in which the dispersed phase is a single substance, but the particles of the dispersed phase are aggregates of many molecules. The aggregates are held together by weak forces, such as van der Waals forces. Associated colloids are not true solutions, but they are also not suspensions. They are sometimes called pseudocolloids.
Hydrophobic colloids are colloids in which the dispersed phase has an aversion to water. This means that the particles of the dispersed phase are repelled by the water molecules in the dispersion medium. This repulsion causes the particles to form a unstable suspension in the water.
Hydrophobic colloids are formed when a substance that is insoluble in water is mixed with water. The molecules of the substance do not dissolve in the water and form a suspension. The suspension is then dispersed into small droplets, which are suspended in the water. The droplets are not stabilized by the attraction between the water molecules and the molecules of the substance.
Hydrophobic colloids are not as common as hydrophilic colloids. They are used in some industrial processes, such as oil recovery.