Question

why is diamond not a lubricant

Answer 1

Answer:

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Explanation:

Both carbon allotropes feature strong C−C bonds. The individual layers are held together by weak bonds, allowing the layers to slide over each other and provide lubrication. In diamond, however, the carbon-carbon bonds are rigidly fixed giving rise to extreme hardness and high melting points.

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Answer 2

Answer:

Diamond is one of the hardest materials available on the planet due to the string bonding between the carbon atoms.

In diamond, the carbon-carbon bonds are rigidly fixed giving rise to extreme hardness and high melting points.