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Dry heat in a hot air oven is typically used at

  • A.160 to 170 degrees Celsius for one to two hours
  • B.121 degrees Celsius for fifteen minutes
  • C.100 degrees Celsius for ten minutes
  • D.200 degrees Celsius for five minutes

Answer: A

Without water to assist protein coagulation, dry heat must oxidise cell constituents, so both the temperature and the time are much greater than an autoclave needs. It suits glassware, powders and oils that steam would spoil or fail to penetrate.

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