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Kaolinite differs from montmorillonite in

  • A.swelling far more when wetted
  • B.being a framework silicate
  • C.having no sheet structure whatever in its lattice
  • D.not swelling appreciably when wetted

Answer: D

Kaolinite's two-layer sheets are held together by hydrogen bonds that water cannot easily enter, while montmorillonite's three-layer sheets admit water between them. That difference decides how a clay soil behaves under a foundation.

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