Soil Chemical Properties MCQs Quiz 3

1. Which form of nitrogen predominantly accumulates in acidic soils?

 NO₂⁻

 NO₃⁻

 N₂

 NH₄⁺

2. Soil solution equilibrium is best described as _______

 Irreversible

 Linear

 Dynamic

 Static

3. The term “soil reaction” refers to the _______ of soil

 pH

 Texture class

 Moisture content

 Temperature regime

4. Continuous application of ammonium-based fertilizers generally _______ soil pH

 Raises pH

 Has no effect

 Decreases pH

 Neutralizes pH

5. Acid rain primarily introduces _______ into soils

 Sodium ions

 H₂SO₄ & HNO₃

 Organic matter

 Calcium carbonate

6. Carbonate (CaCO₃) dissolution in soils consumes _______

 OH⁻

 H⁺

 Na⁺

 Ca²⁺

7. Hydrolysis of Al³⁺ in soil contributes to _______

 Alkalinity

 Salinity

 Neutrality

 Acidity

8. Soil alkalinity generally increases due to the presence of _______

 Organic acid accumulation

 Leaching of bases

 Acid rain inputs

 Carbonates and bicarbonates

9. Which element becomes toxic in soils at low pH due to increased solubility?

 Calcium

 Magnesium

 Potassium

 Aluminum

10. Soils of arid and semi-arid regions are generally _______

 Alkaline

 Neutral

 Variable

 Acidic

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