First slide

Group 14 or carbon family

Question

Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behavior is that graphite ____?

Moderate

A

Is an allotropic form of diamond
B

Has molecules of variable molecular masses like Polymers
C

Has carbon atoms arranged in Large plates of rings of strongly bounds carbon atoms with weak inter plate bounds
D

Is a non – crystalline substance

Solution

In graphite ,carbon is $s p^{2}$ hybridized . Each carbon atom thus linked to three other carbon atoms forming Hexagonal rings. Since only three electrons each carbon are used in making Hexagonal ring. Fourth electron of each carbon is free to move. This makes graphite a good conductors of heat and electricity further graphite has a two dimensional sheet like structure . These various sheets are held together by weak Vander Waal's force of attraction. Due to these weak forces of attraction, it is little difficult to melt. One layer can slip over the other. This makes graphite is lubricant.

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