Soil Chemical Properties MCQs Quiz 1

1. The nitrification of ammonium (NH₄⁺ → NO₃⁻) in soil results in _______

 Release of OH⁻ ions

 Consumption of H⁺

 No change in pH

 Release of H⁺ ions

2. Soils with high buffering capacity typically have _______

 Low clay content

 Low organic matter

 High sand content

 High clay and organic matter content

3. Which soil type exhibits the greatest resistance to changes in pH (highest buffering capacity)?

 Low SOM soil

 Clay-rich soil

 Gravelly soil

 Sandy soil

4. Charge development in humus is mainly _______

 Fixed

 pH-dependent

 Structural

 Permanent

5. Cation exchange capacity (CEC) is defined as _______

 Soil acidity level

 Total nutrients present in soil

 Total amount of exchangeable cations a soil can hold

 Anion exchange capacity of soil

6. In acidic soils, the principal contributor to reserve (potential) acidity is _______

 Na⁺

 Al³⁺

 Ca²⁺

 Mg²⁺

7. Soils developed from limestone-rich parent material are typically _______

 Saline

 Alkaline

 Neutral

 Acidic

8. In humid climates with high rainfall and leaching, soils tend to be _______

 Saline

 Acidic

 Neutral

 Alkaline

9. The pH scale is best described as _______

 Linear

 Arithmetic

 Logarithmic (base 10)

 Exponential

10. Soil pH is defined as _______

 log₁₀[H⁺]

 −log₁₀[OH⁻]

 −log₁₀[H⁺]

 log₁₀[OH⁻]

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