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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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