The gemstone "ruby" is actually with traces of some elements----:

A ) Rubidium oxide

B ) Pur rubidium

C ) Aluminium oxide ✅

D ) None of these

Related Questions
  1. The chemical symbol for calcium is---:
  2. Which element is known as king of metals?
  3. What is the user state of element at room temperature?
  4. Gemstone blue Sapphire known as Neelam due to----?
  5. The chemical symbol for potassium is---:
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