Carbon Allotropy

What is the hardest known natural material on Earth?

• Diamond

• Glass

• Wood

• Steel

In which carbon allotrope do the carbon atoms form a three-dimensional crystal lattice structure?

• graphite

• fullerene

• amorphous carbon

• diamond

Which carbon allotrope is used as a lubricant and in pencil leads?

• Coal

• Charcoal

• Diamond

• Graphite

What is the color of graphite?

• Blue

• Green

• Gray or black

• Red

Which carbon allotrope has a higher density, diamond or graphite?

• Graphene

• Amorphous carbon

• Diamond

• Buckminsterfullerene

Which carbon allotrope conducts electricity due to the delocalized electrons in its structure?

• fullerene

• graphene

• charcoal

• diamond

Which carbon allotrope is used in cutting, grinding, and drilling tools?

• Fullerene

• Diamond

• Graphite

• Amorphous carbon

Which carbon allotrope has a higher melting point, diamond or graphite?

• Fullerene

• Diamond

• Charcoal

• Amorphous carbon

In combined state, carbon occurs as

• coal

• diamond

• graphite

• petroleum

Diamond is used for

• making the electrodes of electric furnaces.

• making crucible for melting metals.

• cutting and drilling rocks and glass.

• making carbon brushes for electric motors.