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Molybdenum oxidises rapidly at high temperature because its oxide is

  • A.of a much larger volume than the metal
  • B.an excellent electrical insulator
  • C.reduced back to the metal by the air
  • D.volatile and escapes from the surface

Answer: D

Molybdenum trioxide sublimes, so the surface is continually stripped of whatever film forms and fresh metal is always exposed. Tungsten behaves similarly, which is why both need protective coatings for service in air at temperature.

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