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WBCS Main Examination 2023 — Paper IV: General Studies II · Question 11 of 200

Q11
General ScienceChemistry
Graphite is a good conductor of electricity due to
  1. a.strong electrostatic bonding.
  2. b.free localized bonds.
  3. c.free delocalized electrons.
  4. d.tetrahedral arrangement of particles.

Answer: (C) free delocalized electrons.

In graphite each carbon uses three electrons for bonds within its layer, and the fourth electron is delocalised across the layer, free to carry current. A tetrahedral arrangement describes diamond, which does not conduct, and localised bonds or electrostatic bonding do not supply mobile charge carriers.

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