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A cooling curve for a pure substance shows a

  • A.rise in temperature during solidification
  • B.horizontal arrest at its freezing point
  • C.gradual change of slope over a range
  • D.continuous curve with no break at all

Answer: B

The latent heat released holds the temperature constant until the last of the liquid has frozen. A mixture other than the eutectic instead shows a break where crystallisation begins and an arrest only at the eutectic temperature.

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