Which element can be fixed by smecitite___________________?
Correct answer: B. Kº
- A. Mgº
- B. Kº
- C. NH2
- D. Both b & c
Explanation
Smectite can retain or fix potassium ions between its expanding layers, although potassium fixation is generally stronger in illite and vermiculite. Option c is written as NH2, not the ammonium ion NH4+, so option b is the valid choice as printed.
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