Question:
Percentage of lead in lead pencil is
Percentage of lead in lead pencil is
Updated On: Jul 28, 2022
- zero
- 20
- 80
- 70
Hide Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
In lead pencil graphite and clay is present, so the percentage of lead is zero.
Was this answer helpful?
0
0
Top Questions on allotropes of carbon
- Species having carbon with sextet of valence electron and acts as an electrophile is:
- JEE Main - 2024
- Chemistry
- allotropes of carbon
- Graphite is a good conductor of electricity due to the presence of-
- CUET (UG) - 2023
- Chemistry
- allotropes of carbon
- The normal rain water is slightly acidic and its $pH$ value is $56$ because of which one of the following ?
- JEE Main - 2023
- Chemistry
- allotropes of carbon
- Amorphous allotrope of carbon is
- TS POLYCET - 2023
- Chemistry
- allotropes of carbon
- In the titration of KMnO4 and oxalic acid in acidic medium, the change in oxidation number of carbon at the end point is _____.
- JEE Main - 2022
- Chemistry
- allotropes of carbon
View More Questions
Questions Asked in AIPMT exam
- The terga, sterna and pleura of cockroach body are joined by
- AIPMT - 2015
- Cockroach
- Three identical spherical shells, each of mass m and radius r are placed as shown in figure. Consider an axis X X' which is touching to two shells and passing through diameter of third shell. Moment of inertia of the system consisting of these three spherical shells about XX' axis is
- AIPMT - 2015
- Moment Of Inertia
- The species $ {Ar, K^+}$ and $ {Ca^{2+}}$ contain the same number of electrons. In which order do their radii increase?
- AIPMT - 2015
- properties of d block elements
- The hilum is a scar on the
- AIPMT - 2015
- Post-Fertilisation : Structures And Events
- The heat of combustion of carbon to $ {CO_2}$ is $ {- 393.5 \, kJ/mol}$. The heat released upon formation of 35.2 g of $ {CO_2}$ from carbon and oxygen gas is:
- AIPMT - 2015
- Enthalpy change
View More Questions
Concepts Used:
Allotropes of Carbon
The existence of a chemical element in one or more physical forms happening in the same physical state is called Allotropes or allotropy. Allotropes may show different physical or chemical states turning on the atom arrangement or the number of existent atoms. While carbon and sulfur is the common element presenting allotropy. Carbon can make further allotropes due to its five-membered valency.
Read More: Allotropes of Carbon
Allotropes of Carbon:
Carbon is part of a p-block element.
- The atomic number of carbon = 6
- It belongs to group 14.
- It makes up about 18.5% of the human body by mass.
Carbon has only two types of allotropes, such as;
- Crystalline
- Amorphous
The crystalline form of carbon consists of allotropes like;
- Diamond
- Graphite
- Fullerenes
The amorphous form of carbon consists of allotropes like;
- Coal
- Coke
- Wood charcoal
- Animal charcoal
- Lampblack
- Gas carbon