Amorphous Minerals Quiz

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5 Questions

What is the main difference between allophane and humus?

Allophane has a variable charge depending on soil acidity, while humus has a high cation exchange capacity

What contributes to the charge of allophane and other amorphous minerals?

Hydroxyl ions (OH-)

Where are allophane and similar clays commonly found?

In soils forming from volcanic ash

What is the primary composition of humus colloids?

Carbon, hydrogen, and oxygen

Which substance is nearly insoluble in water but mostly soluble in dilute alkali solutions?

Humus

Test your knowledge about amorphous minerals such as allophane and their characteristics, including their occurrence in soils and their exchange capacity.

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