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The clay mineral primarily governing the swelling behavior of Black Cotton soil is

1. Halloysite
2. Illite
3. Kaolinite
4. Montmorillonite

Correct answer: Montmorillonite

Solution

Montmorillonite is a type of clay mineral known for its high swelling capacity due to its layered structure and ability to absorb water, making it the primary mineral responsible for the swelling behavior observed in Black Cotton soil.

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