Question

Which compound is called ‘Carborundum’ ?
1. Calcium carbide
2. Aluminium carbide
3. Boron carbide
4. Silicon carbide

Answer 1

Correct Answer - Option 4 : Silicon carbide

The Correct answer is Silicon carbide.

• Silicon carbide​:​
  •  It is commonly known as Carborundum.
  • It is a unique compound of carbon and silicon and is one of the hardest available materials.
  • The chemical formula of silicon carbide is SiC.
  • Its molar mass is 40.10 g/mol.
  • It is a simple compound with the carbon atom attached to silicon through a triple bond, leaving both atoms with a positive and negative charge.
  • However, the bonding between them has a predominantly covalent character, rather than ionic. 

• Calcium carbide: also known as calcium acetylide. CaC2
• Aluminium carbide: chemical formula Al₄C₃, is a carbide of aluminum. 
• Boron carbide: extremely hard crystalline compound of boron and carbon (B4C).