Q.

Which of the following is used as lubricant?

A. Graphite
B. Silica
C. Diamond
D. Iron Oxide
Answer» A. Graphite
Explanation: Graphite is used as a lubricant due to its slippery nature. Due to its loosely intact carbon atoms or free electrons, they can move around easily from one place to another, making graphite a good conductor of electricity.
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