Multiple choice

Which of the following allotropes of carbon can be used as a lubricant as well as lead in pencils?

  1. Diamond

  2. Grease

  3. Buckminsterfullerenes

  4. Graphite

  5. Lead
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Graphite is one of the most common allotropes of carbon. Unlike diamond, graphite is an electrical conductor, and can be used, for instance, as the material in the electrodes of an electrical arc lamp. Graphite holds the distinction of being the most stable form of carbon under standard conditions. Therefore, it is used in thermochemistry as the standard state for defining the heat of formation of carbon compounds and this is also use as lead in pencil..

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