Which of the following statements about graphite is not true? 1- the coordination number of carbon atoms is 4 2-the carbon atoms are arranged layers 3-the layers in graphite are attracted to each other by weak forces 4-the carbon atoms use only three of their four outer electrons for covalent bonding
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Diamond: C is sp
3
hybridised. C is tetrahedrally linked to 4 neighbouring C atoms through 4 strong bonds between them as sp
3
bonds. It extends in 3−D and give rise to 3−D structure. It is very rigid. It is used as gems in making abrasive. Since all the electrons firmly held so it do not conduct electricity as no 'free electron' is present.
Graphite: C is sp
2
hybridised. Each C is linked to 3 other creations forming hexagonal rings. So, it has 2−D sheet-like structure. The various sheets are held by Van der Waal's force of attraction. The layers can slip over the other.
Silicon: It exists in different kinds of structures based on its bonding atoms.
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