Q22 of 44 Page 324

Give reasons:

Graphite is used as lubricant.

Graphite has a layered structure and different layers of graphite are bonded to each other by weak van der Waals’ forces. These layers can slide over each other. Graphite is soft and slippery. Therefore, graphite can be used as a lubricant.


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Diamond is used as an abrasive.

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Aluminium alloys are used to make aircraft body.