The internal & external surfaces of soil colloids are positively and or negatively charged. Mostly ____________ is dominant:
Correct answer: A. Negative
- A. Negative
- B. Positive
- C. Zero
- D. All of the above
Explanation
Soil colloids are predominantly negatively charged because of isomorphous substitution and dissociation of surface groups. Positive charges occur in some soils, especially under acidic conditions, but are generally less common.
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