Soil Chemical Properties MCQs Quiz 5

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

 Clay minerals and organic matter

 Gravel and sand

 Soil water and air

 Primary minerals

2. Cation exchange capacity is commonly expressed in _______

 cmol(+)/kg

 ppm

 kg/ha

 pH units

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

 Liming

 Replacement of Ca²⁺ by H⁺ on exchange sites

 Addition of Ca²⁺

 Gypsum application

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

 Volatilization

 Denitrification

 Immobilization

 Nitrification producing H⁺ ions

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

 Electrostatic attraction

 Diffusion

 Covalent bonding

 Hydraulic pressure

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

 Negative surface charge and large surface area

 High permeability

 Neutral charge

 Low density

7. Which process decreases soil acidity on exchange sites?

 Leaching of bases

 Ammonium fertilization

 Nitrification

 Liming

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

 Organic colloids

 Sand

 Clay

 Humus

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

 Electrostatic adsorption

 Mechanical trapping

 Chemical precipitation

 Biological

10. Humus contributes to cation exchange mainly through _______

 pH-dependent functional groups

 Inert composition

 Crystalline lattice

 Silicate structure

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