General Knowledge - General Science - Discussion

Discussion Forum : General Science - Elements and Metals (Q.No. 4)
Which of the following is used in pencils?
Answer: Option
No answer description is available. Let's discuss.
121 comments Page 1 of 13.

Valentino Isaac Pinto said:   9 months ago
I think the correct answer is option A Graphite.

Noor Zahra said:   1 year ago
As graphite is an allotrope of Carbon, it shows a layering structure. Pencil cast an impression on paper because graphite is made up of carbon atoms and paper is made up of cellulose. Cellulose is an organic polysaccharide compound as we know all organic compounds are made up of carbon atoms. So both paper and graphite have carbon atoms in common so the carbon atom of graphite makes a covalent bond with the carbon atom of paper so the mark is cast. As graphite is mettloid its conductivity decreases with increase in temperature. It's color is black because when carbon black is heated to very high temperature for a long time then graphite is made. So, graphite is made from carbon black so the color of graphite is also black.

Esebame Austine said:   2 years ago
Nice explanation. Thanks all.

Souravee paul roy said:   2 years ago
Graphite has layered structures of layers which are linked by van der Waal forces. Graphite cleans easily between the layers and therefore, it is very soft and slippery. For this reason, it is used in pencil and as lubricants in machines running at high temperature.

Abhishek Anand said:   2 years ago
Yes, Graphite is used in pencils to write.

Hariom k videos said:   4 years ago
Yeah, graphite used in pencil.

Ayush said:   4 years ago
In pencils the graphite is mixed with clay to change the hardness of the Lead. This accounts for its low hardness. This is because the layers can slide over each other easily. In fact the lead in pencil is not pure.

Sanskriti said:   4 years ago
Then, what about charcoal pencils?

Rk said:   5 years ago
Graphite is an allotrope of carbon and hence a non-metal. But still, it conducts heat & electricity due to its structure.

It is used as lubricants (substances reducing friction) and made it easy to write.
This is why it is used for pencils.

Naveen said:   5 years ago
Charcoal pencil are also used in drawing purpose.

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