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Question

Graphite differs from diamond because graphite is:

A
greyish black in colour and bad conductor of electricity
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B
slippery to touch and good conductor of electricity
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C
greyish black in colour and bad conductor of heat
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D
slippery to touch and good conductor of heat
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Solution

The correct options are
A slippery to touch and good conductor of electricity
D slippery to touch and good conductor of heat
Graphite differs from diamond because graphite is slippery to touch and good conductor of electricity.
In graphite, free electrons move throughout the entire layers, and hence graphite is a good conductor of electricity.
Whereas in diamond, there are no mobile electrons in the system. Hence, diamond crystal is non conductor of electricity.

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