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Types of Fire

Give reason :...

Question

Give reason :
(d) Graphite is used in the leads of pencils.

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Solution

(d) Graphite is a black substance.

It is soft and turns paper black when streaked.
So, it is used in lead pencils.

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(a) lithium (b) charcoal (c) lead (d) graphite

Q. Fill in the blank with the right choice of word.

The term lead pencil is a ____ ; pencils are filled with graphite not lead.

State whether the statement is true or false :

Graphite is used in pencils.

Q. Give reason :
Graphite is used as lubricant.

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