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State whether the following is true or false.
The charge on a clay particle is the same on its faces and its edges.

  • A.True
  • B.False
  • C.True only at large scales
  • D.False only at small scales

Answer: B

Faces carry a permanent negative charge from lattice substitution while edges carry a pH-dependent charge that can be positive in acid conditions. Edge-to-face attraction between the two is what produces a flocculated card-house structure.

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