Answer- 5. Black cotton soil is very good for a foundation bed.
The incorrect statement among the options is that the black cotton soil is very good for a foundation bed
According to the question, the incorrect statement is that black cotton soil is very good for a foundation bed. Black cotton soil is clay-rich soil that includes calcium, carbonate, and potassium while also retaining moisture. It is found primarily in the tropical and subtropical regions. In addition to lime, iron, and magnesium, black cotton soil is poor in phosphorus, nitrogen, and organic matter. As a result, lowlands are more fruitful than uplands.
Swell and shrink qualities are present in the Black Cotton Soil. A discrepancy in the volume of soil arises as a result of shrinking and swelling, resulting in cracks in the foundation or structural structure of the building.
The structure's durability and strength are being harmed by the fissures. Cracks are responsible for a large number of structural failures.
Similarly, the load-bearing ability of black cotton soil is exceedingly low, leading to a variety of foundation failures such as punching failure, general shear failure, and so on.
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