Which of the following statements about the buffer curve and acid dissociation constant are correct?
A. The shape of the buffer curve can reflect the magnitude and scope of the soil buffer capacity
B. Different soils have different buffer curves
C. The acid dissociation constant is the pH at the midpoint of the buffer zone
D. The acid dissociation constant of 0-4 belongs to weak acid
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In the soil pH classification, the corresponding pH range of the acid grade is:
A. 5.5-7.5
B. 4.5-7.0
C. 5.0-7.0
D. 5.0-6.5
The main influencing factors of soil acidification donot include:
A. Biology
B. Parent material
C. Time
D. Climate
Which of the following statement about soil buffer capacity is correct?
A. The amount of acid or alkali that needs to be added to cause the soil pH change
B. The smaller the buffer capacity, the easier the soil pH changes and the weaker the buffer capacity
C. For different soils, their buffering capacities are similar
D. The requirement of acid or alkali to change the unit pH cannot be estimated through the buffer curve
Which of the following description does not belong to the cause of soil acidification?
A. The adsorbed hydrogen ions and aluminum ions in soil colloid are exchanged by other cations
B. The carbon dioxide and various organic acids will be produced as organic matter in the soil used by microorganisms and bacteria
C. The ammonia in the soil could converted into nitrous acid and nitric acid, and the sulfide is converted into sulfuric acid as the materials in the soil used by microorganisms and bacteria
D. The pH of soil will increase as soil organic matter decomposed by microorganisms to produce ammonia in ammoniation process
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