Question

The range of Cation exchange capacity of kaolinite clay mineral is :

• A. 3-15 cmol (\(\text{p}^+\))/kg
• B. 20-45 cmol (\(\text{p}^+\))/kg
• C. 80-120 cmol (\(\text{p}^+\))/kg
• D. 120-150 cmol (\(\text{p}^+\))/kg

Hint:

- 1:1 Non-expanding clay (Kaolinite): lowest CEC (3-15 cmol (\(\text{p}^+\))/kg).
- 2:1 Non-expanding clay (Illite): medium CEC (20-40 cmol (\(\text{p}^+\))/kg).
- 2:1 Expanding clay (Montmorillonite): high CEC (80-150 cmol (\(\text{p}^+\))/kg).
- Organic matter (Humus): extremely high CEC (100-300 cmol (\(\text{p}^+\))/kg).

Answer 1

The Correct Option is A