Question

Choose the correct statment(s) for graphite :

• A. Graphite is used as a dry lubricant
• B. Each C atom in hexagonal ring make three sigma bonds with neighboring C atoms
• C. Electrons are immobile and localized over the whole sheet.
• D. Electrons are mobile and localized over the whole sheet

Answer 1

Answer: (A), (B), (D)

Electrons are mobile and localized over the whole sheet

Graphite :
Graphite is used as a dry lubricant in machines running at high temperatures, where oil cannot be used as a lubricant.
Graphite cleaves easily between the layers; hence it is very soft and slippery.

Electrons are mobile and delocalized over the whole sheet therefore graphite conducts electricity along the sheet.

Each C atom in hexagonal ring make three sigma bonds with three neighboring C atoms and the fourth electron forms a $\pi$ bond.