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Question

Graphite is a soft lubricant extremely which is difficult to melt. What is the reason for this anomalous behaviour?


A

It has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interpolate bonds.

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B

It is a non-crystalline substance.

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C

It is an allotropic form of carbon.

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D

It has only single bonds between carbon atoms.

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Solution

The correct option is A

It has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interpolate bonds.


Graphite is a soft lubricant extremely but is difficult to melt. The reason for this anomalous behaviour is that graphite has carbon atoms which are covalently bonded with three other carbon atoms which are arranged in a sheet-like structure stacked over one another. The bonds within the sheet are strong but between the layer is weak. The weak force between the layers makes it a good lubricant but the strong force in the sheet makes it hard to melt.


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