Kaolinite is a 1:1 layer silicate clay mineral. What is its cation exchange capacity?
Correct answer B. 3-15 meq/100 g CEC
Explanation
Kaolinite has almost no isomorphous substitution and no accessible interlayer surface, so its charge comes only from broken edges, giving a low CEC of about 3 to 15 cmol per kg.
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