Multiple choice general knowledge science & technology

Which of the following is used as a lubricant?

  1. Graphite

  2. Silica

  3. Iron Oxide

  4. Diamond
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A Correct answer
Explanation

Graphite is an excellent solid lubricant due to its layered structure. The weak van der Waals forces between graphene layers allow them to slide easily over each other, making graphite useful in locks, hinges, and industrial applications.

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