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Boron carbide is used for armour and abrasives because it is

  • A.extremely hard and unusually light
  • B.very soft and easy to shape
  • C.the cheapest ceramic available
  • D.an excellent electrical conductor

Answer: A

It is among the hardest materials known and has a low density, which matters greatly where the armour must be worn or carried. The cost is high and it is difficult to sinter, which limits it to applications that justify both.

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