Question

Which is the hardest compound of boron?

• A. $B_2O_3$
• B. $BN$
• C. $B_{4}C$
• D. $B_{2}H_{6}$

Answer 1

Answer: (C)

$B_{4}C$

Answer 2

Boron carbide $B_{4}C$ is a very hard substance like $SiC$.