Question

From which of the following substance pencil lead is formed?

Options

• Charcoal

• Wood

• Lead

• Graphite

Answer 1

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.