Which of the following is not an a insulator. a. Graphite. b. Wood. c. Pure water. d. Rubber.
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Unlike metals which have a 'sea' of free electrons that can be used to conduct electricity, Sulphur is an insulator.
Copper and iron being metals conduct electricity due to the presence of free electrons.
Graphite conducts electricity due to the motion of non bonded electrons between its adjacent layers.
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Answer:
c. Pure water is not an insulator
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