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Question

Which of the following solids cannot conduct electricity?
1. Graphite 2. Cs 3. Diamond

A
1 and 2
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B
1 and 3
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C
Only 2
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D
Only 3
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Solution

The correct option is D Only 3
Cs is a metal. So it is a good conductor of electricity.
We know covalent solids can't conduct electricity.
Diamond is insulator since it is a covalent solid.
Even though graphite is a covalent solid, it can conduct electricity due to the presence of delocalised electrons in it.

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