General Knowledge - General Science - Discussion

Discussion Forum : General Science - Elements and Metals (Q.No. 4)
4.
Which of the following is used in pencils?
Graphite
Silicon
Charcoal
Phosphorous
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
121 comments Page 10 of 13.

Brajesh shakya said:   10 years ago
Graphite is softonic substance because use the pancle.

Daniel Wundengba said:   10 years ago
Pencil has a black color as well as graphite. So that is truly the answer.

Guru said:   10 years ago
Because of soft graphite such as 8b.

Purva said:   10 years ago
Graphite is the answer.

Rupesh said:   10 years ago
What is the atomic number of graphite?

Sudev S Sunish said:   10 years ago
Graphite is softest form of carbon and is used in lubrication.

Bali said:   9 years ago
Graphite is the correct answer.

Lily said:   9 years ago
Graphite is another giant covalent structure made of carbon atoms. In graphite, each carbon atom is joined to three others, forming layers:.

Diagram showing graphite structure.

The bonds between the layers are much weaker than covalent bonds. This enables the layers to slide over each other, making graphite soft. Graphite can also conduct electricity, between the layers of carbon atoms.

Graphite is used as pencil 'lead'. As the pencil moves across the paper, layers of graphite rub off.

Nive... said:   9 years ago
Hi, @Tin. Your explanation is correct. I think so that the substance is clay powder.

Dane said:   9 years ago
I agree with you @Lily.

The graphite has van der Waals forces between its layers and this makes it soft when writing.


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