Question

Cation exchange capacity of Kaolinite is

A.

8–100 cmol (p⁺) kg⁻¹

B.

15–40 cmol (p⁺) kg⁻¹

C.

3–15 cmol (p⁺) kg⁻¹

D.

10–40 cmol (p⁺) kg⁻¹

E.

Answer not known

Correct option is C

Kaolinite is a 1:1 type clay mineral.
It has low surface area and minimal isomorphous substitution.
Hence its cation exchange capacity is very low.
CEC of kaolinite generally ranges from 3 to 15 cmol (p⁺) kg⁻¹.
It is lower than illite and much lower than montmorillonite.
Therefore option (c) is correct.

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