The processes of replacement of one atom by another atom of similar size, in a crystal lattice of a soil clay without disrupting or changing the crystal structure of the mineral is termed as

A. Ion exchange

B. Percentage base saturation

C. Isomorphic substitution

D. Polymorphism

Answer: Option C

Solution(By Examveda Team)

The process of replacement of one atom with another atom of similar size, in a crystal lattice of a soil clay without disrupting or changing the crystal structure of the mineral, is termed Isomorphic substitution.
It can also be referred to as the process where one structural cation is replaced by another of similar size and this kind of replacement signifies the primary cause of both negative and positive charges in clay minerals.