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Deep blue colour is imparted to glass by the presence of

  • A.Cupric oxide
  • B.Nickel oxide
  • C.Cobalt oxide
  • D.Iron oxide

Answer: C

Cobalt oxide gives glass a deep blue colour, which is why it is called cobalt blue.

Other oxides give other colours: copper turquoise, chromium green, manganese purple and iron a bottle green. A very small quantity of cobalt colours a large mass of glass.

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