Some Soil Colloids Exhibit Positive Charges Under Highly Acid Conditions

question 16

Multiple Choice

Some soil colloids exhibit positive charges under highly acid conditions.To what are these charges likely due?

• A)protonation of some hydroxy groups by excess H⁺ ions
• B)the adsorption of Al³⁺ ions on the colloid
• C)the release of some OH^- ions leaving an unsatisfied positive charge on the colloid
• D)substitution of lower valent atoms for higher valent atoms in the octahedral sheet
• E)increase in the level of H⁺ ions on the exchange complex

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