66ᵗʰ B.P.S.C. (Re. Exam) (Pre) 2020
The chemical formula of sapphire (Ruby) is :
aAl₂O₃✓ Correct
bAl₃O₂
cN₂O
dNO₂
eNone of the above/More than one of the above
Explanation
Sapphire is a gemstone mineral. Its chemical formula is Al₂O₃. Sapphire is found in nature and can also be made artificially. Note that sapphire and ruby are different.
general-geography