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Question

Name the metal which is present as impurity in "sapphire".


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Solution

Explanation for Correct answer:-

  • Sapphire is a delicate gemstone made up of Aluminium-oxide and trace quantities of other elements including Copper(Cu), Magnesium(Mg), etc.
  • Sapphire is also the impure form of Alumina(Al2O3).
  • Also, Sapphire contains Cobalt(Co) as an impurity.

Therefore, Cobalt(Co) is a metal that is present as an impurity in “sapphire”.


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