Question

Intermixing of particles of two different types of matter on their own is called:
A. Heterogeneity
B. Diffusion
C. Homogeneous
D. Both A and B

Answer 1

Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. Diffusion happens in liquids and gases because their particles move randomly from place to place. Diffusion is an important process for living things; it is how substances move in and out of cells.

Complete step by step answer:
Let us discuss each term one by one.
A. Heterogeneity: The property by virtue of which the formation of a heterogeneous mixture takes place. A heterogeneous mixture is simply any mixture that is not uniform in composition - it's a non-uniform mixture of smaller constituent parts. By contrast, a mixture that is uniform in composition is a homogeneous mixture. This does not include the intermixing of particles of different substances.
B. Diffusion: Diffusion is the process of movement of molecules under a concentration gradient. It is an important process occurring in all living beings. Diffusion helps in the movement of substances in and out of the cells. The molecules move from a region of higher concentration to a region of lower concentration until the concentration becomes equal throughout. Liquid and gases undergo diffusion as the molecules are able to move randomly. In this, the intermixing of particles of the substances of different types takes place on their own.
C. Homogeneous: A mixture which has uniform composition throughout its mass is called homogeneous mixture. It is formed by the help of an external force.
Thus, the correct option is B. Diffusion.

Note:
Diffusion is widely used in various fields such as biology, physics, chemistry, etc. Diffusion can be classified into two main types: Simple diffusion and facilitated diffusion. A process in which the substance moves through a semipermeable membrane or in a solution without any help from transport proteins is known as the simple diffusion. Facilitated diffusion is a passive movement of molecules across the cell membrane from the region of higher concentration to the region of lower concentration by means of a carrier molecule.