Why graphite is used in pencil lid ?
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Explanation:
This slippery-sheet structure is what makes graphite so oily to the touch and makes it such a good material to write with. The carbon sheet fragments readily rub off the pencil core and onto the paper. This property also makes graphite powder an ideal dry lubricant.
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Answer:
Graphite has layered structure layers are held by van der Waal forces. Graphite cleans easily between the layers and therefore, it is very soft and slippery. For this reason, it is used in pencil and as lubricants in machines running at high temperature.
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