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Differential thermal analysis detects a reaction in a sample by measuring

  • A.the mass that it loses as it is heated up
  • B.the gas that is evolved during the reaction
  • C.its electrical resistance while it is hot
  • D.its temperature against an inert reference

Answer: D

A reaction absorbing or releasing heat makes the sample lag or lead the reference, and the difference is plotted against temperature. Thermogravimetry is the companion technique that follows mass rather than temperature.

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