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State whether the following is true or false.
An exothermic peak near a thousand degrees in a clay is generally attributed to mullite formation.

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

Answer: B

The crystallisation releases heat and produces a characteristic sharp exotherm well above the dehydroxylation endotherm. Its presence and size are used to judge how much mullite a clay will form. The peak is absent from a clay that forms no mullite at all.

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