MINERAL AND ENERGY RESOURCES IN INDIA
MINERALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Graphite
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Carbon
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Allotrope
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Metal
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Detailed explanation-1: -It is made from a form of carbon called graphite. The graphite is mixed with clay and formed into long thin pencil lead.
Detailed explanation-2: -Plumbago pencil lead, to be exact. To get all geologist on you, plumbago is a naturally-occurring crystalline form of carbon arranged in a hexagonal structure.
Detailed explanation-3: -Pencils contain a form of solid carbon known as graphite.
Detailed explanation-4: -Therefore, graphite is used in pencils. It leaves a black trace of writing on paper because it consists of layers of carbon atoms that slide over each other, option (D) is correct.
Detailed explanation-5: -A pencil lead is made from graphite mixed with clay. Graphite is a naturally soft substance and clay is mixed with it to make it harder. This means a lead with a high graphite content is known as a soft lead and pencils with a soft lead will make a dark mark when used.