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A carbon or graphite refractory must be protected from

  • A.oxidising atmospheres
  • B.reducing atmospheres
  • C.basic slags only
  • D.mechanical load at high temperature

Answer: A

It burns away in the presence of oxygen, so it is used in reducing conditions such as a blast furnace hearth or under a protective coating. Its high thermal conductivity and excellent thermal shock resistance are its merits.

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