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    Question

    Choose the correct option

    Assertion (A): Black soils have swelling and shrinking characteristics

    Reason(R): Black soils are rich in montmorillonite which has tendency to swell when wet and shrink when dry.

    A Both A and R are true and R is the correct explanation of A. Correct Answer Incorrect Answer
    B Both A and R are true, but R is not the correct explanation of A. Correct Answer Incorrect Answer
    C A is true, but R is false Correct Answer Incorrect Answer
    D A is false, but R is true. Correct Answer Incorrect Answer

    Solution

    Black soils are rich in montmorillonite (2:1 type clay mineral) which has tendency to swell when wet and shrink when dry.

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