- The hardness of the pencil lead is determined by the ratio of graphite to clay; a higher clay content results in a harder lead and lighter mark. - The term "lead" is historical, originating from the time when pencils were made using lead or lead alloys before graphite came into common use.
Lead pencil contains
Asked in UPPSC Upper Mains 2006 · Topic: Carbon and Its Various Forms (Graphite: Structure, properties, and uses (including electrical conductivity))
More Chemistry questions
- Graphite is a good conductor of electricity due to
- The allotrope of carbon having layer structure is
- Which of the following is used in pencils?
- Which one of the following properties is NOT true for graphite ?
- Graphite is a much better conductor of heat and electricity than diamond. This is due to the fact that each carbon atom in graphite:
- The hybridized state of carbon in Fullerene is : - (5) Question not attempted
- Which of the following substances cause temporary hardness in water? 1. Mg(HCO3)2 2. Ca(HCO3)2 3. CaCl2 4. MgSO4 Select the correct answer using the code given below.
- Permanent hardness of water cannot be removed by which one of the following methods?