Diamond is hard because
Aof weak intermolecular bonds
Bcarbon atoms form 4 strong covalent bonds in 3D networkCORRECT
Cit contains metal
Dof ionic bonding
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Why the answer is B, and why the others tempt you.
Diamond: each C atom bonded covalently to 4 others in a rigid 3D giant covalent lattice.
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