Chemistry Solids ETEA 2016
PMDC Verified Question 52 of 54
Graphite is one of the allotropic form of Carbon. It is:
A
Isotropic
B
Anisotropic
C
Good conductor of electricity
D
Both B and C
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Both B and C
Concept:
Allotropes are different structural forms of the same element. Graphite is a crystalline allotrope of carbon with unique directional properties.

Solution:
  • Graphite consists of layers of \( \text{sp}^2 \) hybridized carbon atoms, leaving one unhybridized p-electron per atom that becomes delocalized.
  • Because these delocalized electrons can move freely parallel to the layers, graphite is a good conductor of electricity (Option C).
  • However, it does not conduct electricity perpendicular to the layers. This directional dependency means it is anisotropic (Option B).
  • Therefore, both B and C are correct.


Why other options are incorrect:
  • A: Isotropic means properties are identical in all directions (like in amorphous solids), which contradicts graphite's layered structure.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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