A. Graphite
B. Silica
C. Diamond
D. Iron oxide
Submitted by: Fahad Mehsud
Graphite is best suited for lubrication in air. It is a mineral made of loosely bonded sheets of carbon atoms, giving it a slippery texture that makes it a very effective lubricant.
Correct Answer: Graphite ✔
Last Updated: June 08, 2020