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Zircon, used in glazes and refractories, has the composition

  • A.zirconium silicate
  • B.pure zirconium oxide
  • C.zirconium carbide
  • D.zirconium nitride

Answer: A

It is the natural mineral from which zirconia is produced and is itself a very effective opacifier in glazes. Its low thermal expansion also makes it useful in refractories subject to thermal shock. Zircon sand is also used directly in foundry moulds.

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