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Questions and Answers
What is the main difference between allophane and humus?
What is the main difference between allophane and humus?
- Allophane is crystalline, while humus is amorphous
- Allophane is soluble in water, while humus is insoluble
- Allophane has a variable charge depending on soil acidity, while humus has a high cation exchange capacity (correct)
- Allophane is a product of plant and animal remains, while humus is a mixture of silica and alumina
What contributes to the charge of allophane and other amorphous minerals?
What contributes to the charge of allophane and other amorphous minerals?
- Silica and alumina
- Carbon atoms
- Hydroxyl ions (OH-) (correct)
- Iron oxide
Where are allophane and similar clays commonly found?
Where are allophane and similar clays commonly found?
- In soils forming from volcanic ash (correct)
- In mountainous regions
- In clay-rich riverbeds
- In sandy desert soils
What is the primary composition of humus colloids?
What is the primary composition of humus colloids?
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Which substance is nearly insoluble in water but mostly soluble in dilute alkali solutions?
Which substance is nearly insoluble in water but mostly soluble in dilute alkali solutions?
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