A) graphite is in powder form
B) diamond has\[s{{p}^{2}}\]hybridization but graphite has\[s{{p}^{3}}\]hybridization
C) graphite is in planar form while diamond is in tetrahedral form
D) graphite is covalent and diamond is ionic
Correct Answer: C
Solution :
In diamond each carbon atom is\[s{{p}^{3}}\]hybridized and is joined to each by strong covalent bonds and form tetrahedral structure. In graphite carbon is\[s{{p}^{2}}\] hybridized. The carbon atoms join each other to form planar, hexagonal sheet like structure held together by weak van der Waal force. Therefore, diamond is harder than graphite.
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