Q.

Which of the following is the purest form of Carbon?

A. Charcoal
B. Granite
C. Diamond
D. Graphite
Answer» C. Diamond
Explanation: Because the carbon atoms in diamond are more tightly bound than in graphite (as diamond is the hardest material known), it is more difficult for impurities to get into the diamond lattice and as a result diamonds are often more pure than graphite.
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