Chemistry Solids NUMS 2022
PMDC Verified Question 41 of 54
Nature of diamond as solid is
A
Covalent
B
Molecular
C
Ionic
D
Metallic
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Covalent
Concept:
The classification of a solid depends entirely on the type of bonds holding its constituent particles together in the lattice.

Solution:
  • In diamond, the lattice points are occupied by carbon atoms.
  • Every single carbon atom is bonded to four adjacent carbon atoms via strong, directional covalent bonds, forming a massive, continuous 3D tetrahedral network.
  • Because the entire crystal is held together by this covalent network, diamond is unequivocally classified as a covalent solid (or network covalent solid).


Why other options are incorrect:
  • B: It does not consist of discrete molecules held by Van der Waals forces.
  • C, D: There are no ions or sea of free electrons in diamond.

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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