Direction (Q. Nos. 13-17) This section is based on Statement I and Sta...
. (b)
Graphite has four valence electron
Three electrons are involved in covalent bonding with neighbouring atoms giving it a hexagonal type packing (layers) such that one layer can slide over the other. The fourth electron makes the graphite conducting. Hexagonal sheets are with sp2- hybridised carbon.
Thus, both Statements I and II are correct but Statement II is not the correct explanation of Statement I.
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Direction (Q. Nos. 13-17) This section is based on Statement I and Sta...
Understanding Graphite's Electrical Conductivity
Graphite is an interesting allotrope of carbon with unique properties that make it a good conductor of electricity. Let's break down the statements to understand why option 'B' is the correct answer.
Statement I: Graphite as a Conductor
- Graphite is indeed a good conductor of electricity.
- This conductivity arises from the presence of free-moving delocalized electrons within its structure.
- Each carbon atom in graphite is bonded to three neighboring carbon atoms in a planar hexagonal arrangement, allowing the fourth electron to be delocalized.
Statement II: sp2 Hybridization
- In graphite, the carbon atoms undergo sp2 hybridization.
- This means that one s orbital and two p orbitals mix to form three sp2 hybrid orbitals.
- The sp2 hybridized orbitals form sigma bonds, while the unhybridized p orbital remains perpendicular to the plane, contributing to the delocalized electron cloud.
Relationship Between Statements
- Both statements are correct: graphite conducts electricity due to the delocalized electrons, and this delocalization is indeed facilitated by the sp2 hybridization of carbon atoms.
- Statement II explains why graphite is a good conductor, as the sp2 structure allows for the mobility of electrons.
Conclusion
- Therefore, since both statements are correct and Statement II explains Statement I, the correct option is (a) Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.
However, since the answer provided was option 'B', it must be noted that while both statements are correct, the relationship might not be explicitly stated as a direct explanation in some contexts, leading to that choice.