Soil Chemical Properties MCQs Quiz 5

1. Cation exchange on soil colloids is primarily a _______ process

 Biological

 Chemical precipitation

 Mechanical trapping

 Electrostatic adsorption

2. Which soil fraction contributes least to cation exchange reactions?

 Organic colloids

 Clay

 Humus

 Sand

3. Cation exchange capacity is commonly expressed in _______

 kg/ha

 pH units

 cmol(+)/kg

 ppm

4. Which process decreases soil acidity on exchange sites?

 Ammonium fertilization

 Nitrification

 Liming

 Leaching of bases

5. Which mechanism explains the attraction of cations to soil colloids?

 Hydraulic pressure

 Electrostatic attraction

 Covalent bonding

 Diffusion

6. The major soil components responsible for cation exchange are _______

 Gravel and sand

 Clay minerals and organic matter

 Soil water and air

 Primary minerals

7. Humus contributes to cation exchange mainly through _______

 pH-dependent functional groups

 Inert composition

 Silicate structure

 Crystalline lattice

8. Application of ammonium-based fertilizers increases soil acidity due to _______

 Denitrification

 Volatilization

 Nitrification producing H⁺ ions

 Immobilization

9. The high cation exchange capacity of soil colloids is mainly due to their _______

 Negative surface charge and large surface area

 Neutral charge

 Low density

 High permeability

10. Which process increases soil acidity on cation exchange sites?

 Replacement of Ca²⁺ by H⁺ on exchange sites

 Addition of Ca²⁺

 Gypsum application

 Liming

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