Q. The hardest substance amongst the following
A) $Be_{2}C$
B) $Tritonium$
C) $B_{4}C$
D) Graphite
Explanation
(c)
$B_{4}C\ is\ the\ hardest\ substance$ along with diamond
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.