Materials used in pencils: The writing core of ordinary pencils is made of which substance? Consider the soft, electrically conductive carbon form used for marking on paper. Choose the correct material.
General Knowledge
General Science
Difficulty: Easy
Choose an option
Answer
Correct Answer: Graphite
Explanation
What is being asked?The material that forms the pencil 'lead'.
Given data
- Pencils use a carbon form mixed with clay (no metallic lead).
Concept/ApproachThe pencil core is graphite (sp2 carbon) blended with clay and waxes; charcoal is too friable, silicon and phosphorus are not used.
Final AnswerGraphite