Which of the following is used as lubricant ?

Graphite

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Charcoal

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Diamond

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Coke

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Solution

The correct option is C Graphite
Graphite is a mineral made of loosely bonded sheets of carbon atoms, giving it a slippery texture that makes it a very effective lubricant. This slippery quality also makes graphite a good material for pencil lead because it easily sloughs off onto paper.

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