Maximum fixation of K occurs:__________?
Correct answer: C. 2:1 clay mineral
- A. 1:1 clay mineral
- B. 1:2 clay mineral
- C. 2:1 clay mineral
- D. 2:2 clay mineral
Explanation
Potassium fixation is greatest in expanding 2:1 clay minerals, especially illite and vermiculite, where K⁺ becomes trapped between mineral layers. The layer structure of 1:1 clays does not provide comparable fixation sites.
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