44th B.P.S.C. (Pre) 2000
Which is the hardest in the following?
aDiamond✓ Correct
bGlass
cQuartz
dPlatinum
Explanation
Diamond is the hardest natural substance. In diamond, each carbon atom is strongly bonded to other carbon atoms. As a result, it has a rigid three-dimensional structure. Due to its hardness, it is used for cutting glass and for making tools that drill holes in hard stones.
general-science