Question

Which of the following statement about boron carbide is wrong?

• A. Its molecular formula is $B_{4}C$.
• B. It is also called Norbia.
• C. It is the hardest substance.
• D. It is used for cutting glasses.

Answer 1

The correct option is C It is the hardest substance.

Boron carbide $B_{4}C$ is an extremely hard boroncarbon ceramic material used in tank armor, bulletproof vests, engine sabotage powders and is called Norbia.

In the arts, silicon carbide is a popular abrasive in modern lapidary due to the durability and low cost of the material. In manufacturing, it is used for its hardness in abrasive machining processes such as grinding, honing, water-jet cutting and sandblasting.

Particles of silicon carbide are laminated to paper to create sandpapers and the grip tape on skateboards.