Which of the following compounds act/s as buffering agents in soil?
1. Carbonates
2. Phosphates
3. Arsenates

Correct option is B

The correct answer is (b) Only 1 and 2
Explanation:
· Carbonates and phosphates are known to act as buffering agents in soils.
· They help in maintaining soil pH stability, preventing rapid acidification or alkalization.
· Carbonates (like calcium carbonate) buffer acidic soils by neutralizing H⁺ ions.
· Phosphates also contribute to buffering capacity, especially in acidic soils.
· Arsenates, being toxic, do not serve buffering functions.
Information Booster:
· Soil pH affects nutrient availability and microbial activity.
· Buffering agents resist drastic changes in pH.
· Limestone (calcium carbonate) is commonly added to acidic soils.
· Phosphate fertilizers contribute to both nutrients and buffering.
· Buffering capacity is crucial for sustainable agriculture.
Additional Information:
· Arsenates are harmful and interfere with phosphate uptake in plants.
· Excess phosphate can cause eutrophication in nearby water bodies.
· Acidic soils are common in high rainfall regions; alkaline in dry areas.
· Proper soil pH ensures optimal root and microbial function.