Which of the following is an example of sorption?a.Cotton dipped in inkb.Oxygen on metal surfacec.Water on silica geld.Sponge in water

Sorption is a physical and chemical process by which one substance becomes attached to another. It can be either absorption, where one substance penetrates the inner structure of the other, or adsorption, where one substance adheres to the surface of the other.

a. Cotton dipped in ink: This is an example of absorption. The ink penetrates the cotton fibers.

b. Oxygen on metal surface: This is an example of adsorption, which is a type of sorption. The oxygen molecules adhere to the surface of the metal.

c. Water on silica gel: This is also an example of adsorption, hence a type of sorption. The water molecules adhere to the surface of the silica gel.

d. Sponge in water: This is an example of absorption. The water penetrates the sponge's porous structure.

So, the examples of sorption from the options given are b. Oxygen on metal surface and c. Water on silica gel.