Question

The carbon pencil (commonly called lead pencil) is actually made of a mixture of graphite and
clay. In a particular batch of pencils, the percentage of graphite was increased.
A number of complaints were received from the users saying that the pencil was sliding on
paper and therefore it had become difficult to write. What is the probable reason for this?
a. graphite has a high melting point.
b. graphite is a form of carbon.
c. graphite is a lubricant.
d. graphite is a non-metal.

Answer 1

Answer:

c. graphite is a lubricant.

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