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Standard XII
Chemistry
Question

Carbon in the form of .................. can be used in preparation of pencil.
  1. graphite
  2. dry ice
  3. both a and b
  4. none of the above

A
none of the above
B
graphite
C
dry ice
D
both a and b
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Solution
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Graphite contains carbon atoms in hexagonal rings, which are joined to form layers. Graphite is a good conductor of heat and electricity. Since graphite contains free electrons, it is a good conductor of heat and electricity. Carbon in the form of graphite is useful in the preparation of pencils.

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