Assertion :Diamond is a bad conductor of electricity. Reason: There are no free electrons in it.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Diamonds are a bad conductor of electricity as they do not contain any free electrons in their outermost orbit.
The carbon atoms in diamonds show $s p^{3}$ hybridization thus all the valencies of the carbon are satisfied by the other carbon atom and no free electrons are present.

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