1. The major contributor to exchangeable acidity in soils is _______

 Ca²⁺

 Mg²⁺

 Al³⁺

 Na⁺

2. Base saturation refers to the proportion of _______ occupying the soil’s cation exchange sites

 Exchangeable hydrogen ions (H⁺) only

 Cations like Ca²⁺, Mg²⁺, K⁺, Na⁺

 H⁺, Al³⁺

 Micronutrient cations

3. In soil management, the most effective neutralizing agent for correcting soil acidity is _______

 Sand

 Silt

 Calcium carbonate

 Clay

4. __________________ is the process that consumes H⁺ ions and thereby raises soil pH

 Nitrification

 Acid rain deposition

 Lime application

 Organic matter decomposition

5. In soil solution chemistry, equilibrium reactions are generally _______

 Linear

 Irreversible

 One-directional

 Reversible

6. The equation represents the dissociation (ionization) of water molecules _______

 H₂O ⇌ H⁺ + OH⁻

 H₂O + CO₂ → H₂CO₃

 H₂O → H⁺ + O₂

 H₂O → H₂ + O₂

7. Root respiration contributes to soil acidity by releasing _______

 CO₂

 N₂

 O₂

 CH₄

8. The pH scale is _______

 Exponential

 Logarithmic

 Arithmetic

 Linear

9. _______ is least associated with influencing soil pH

 Soil color

 Rainfall

 Fertilizer application

 Parent material

10. In soil, the biological transformation of ammonium (NH₄⁺) to nitrate (NO₃⁻) (nitrification) leads to _______

 Acidification

 Alkalinity

 Salinity

 Neutrality

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Soil Chemical Properties MCQs

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