Assertion: Diamond is an excellent conductor of electricity.
Reason: Diamond has a high density of free electrons.
Both assertion and reason are true, and the reason is the correct explanation of the assertion.
Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
The assertion is true, but the reason is false.
Both assertion and reason are false.
The assertion is false. Diamond is actually an excellent insulator and does not conduct electricity well. The reason provided for the assertion is also false. Diamond does not have a high density of free electrons, as it is a covalently bonded substance and does not have free electrons available for conduction. Hence option 4 is the correct answer.
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