Which statements about the allotropes of carbon are correct?
Statement 1: In graphite, each carbon atom forms three covalent bonds.
Statement 2: Graphite has a high melting point because the forces between its layers are strong.
Statement 3: Graphene conducts electricity because it has delocalised electrons.
Statement 4: Diamond does not conduct electricity because it has no delocalised electrons.
1 and 3 only
2 and 4 only
1, 3 and 4 only
1, 2 and 4 only
122 exam-style questions on OCR GCSE Chemistry 2.3 Properties of materials, covering 2.3.1 Carbon bonding and the variety of organic compounds, 2.3.2 Diamond, graphite, fullerenes and graphene, 2.3.3 Bond strength, changes of state and predicting states, 2.3.4 Bulk properties and types of bonding, and 2.3.5 Nanoparticles: scale, surface area, uses and risks. Each one has a worked solution and a mark scheme showing where the marks go.