Soil Chemical Properties MCQs (Quiz 9)

1. Salinity reduces plant growth by affecting _______

 Nutrient uptake

 Water uptake

 All of these

 Photosynthesis

2. Carbonic acid formation in soils is represented by _______

 H₂O + O₂ → H₂O₂

 N₂ + H₂ → NH₃

 CO₂ + H₂O → H₂CO₃

 SO₂ + O₂ → SO₃

3. Acid rain is primarily caused by a chemical reaction that begins when compounds like ________________are released into the atmosphere

 Sulfur dioxide and nitrogen oxides

 Carbon dioxide

 Oxygen

 Methane

4. Acid rain intensity is measured using _______

 SAR

 EC

 CEC

 pH

5. The oxidation state of nitrogen in NO₃⁻ is _______

 +5

 -3

 +2

 0

6. Soil organic matter decomposition results in _______

 Only volatilization

 Loss of nutrients permanently

 No nutrient transformation

 Mineralization or immobilization, depending on C:N ratio

7. Increase in soil organic carbon (SOC) generally leads to _______

 Higher soil salinity

 Improved soil structure and nutrient retention

 Reduced microbial activity

 Lower cation exchange capacity

8. A narrow C:N ratio in organic residues generally leads to net _______

 Denitrification losses

 Nitrogen mineralization

 Nutrient leaching

 Nitrogen immobilization

9. Denitrification involves _______

 Ammonia oxidation

 Reduction of nitrate to gaseous forms

 Formation of nitrate

 Immobilization of nitrogen

10. High electrical conductivity (EC) in soil indicates _______

 Acidity problem

 Salinity problem

 Neutral soil reaction

 Low fertility

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