Which form of carbon is used as a dry lubricant?
AGraphite
BDiamond
CCoke
DCoal
Answer:
A. Graphite
Read Explanation:
The allotrope of carbon, graphite is used as a dry lubricant.
Graphite is slippery in nature and offers lubrication at high temperatures.
It is, thus, used as a dry lubricant and is mostly preferred better than liquid and oil lubricants.
Graphite is an allotrope of carbon characterized by its layered structure.
Each layer consists of carbon atoms arranged in a hexagonal lattice, similar to a honeycomb.
Within each layer, the carbon atoms are strongly bonded together by covalent bonds.
However, the forces holding these layers together are weak van der Waals forces.