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प्रश्न
From which of the following substance pencil lead is formed?
विकल्प
Charcoal
Wood
Lead
Graphite
MCQ
उत्तर
Graphite
Explanation:
Pencil lead is formed of graphite. Graphite is an allotropic form of carbon in which each carbon atom is joined to three others, forming layers:
Weak van der Waals forces hold these layers together, allowing them to slide over one another, making graphite flexible and slippery.
As a result, graphite is employed as a pencil lead.'
Layers of graphite rub off as the pencil glides across the paper, leaving black imprints on the surface.
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