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a
atoms
b
molecules
c
+ve ions
d
+ve ions in a sea of electrons
answer is A.
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Detailed Solution
In the case of covalent crystals the constituent particles are atoms and they are held together by strong covalent bond network. In carborundum covalent bond network is constituted by Si and C atom which are held very strongly at their positions. Hence, carborundum is a covalent crystal and is very hard