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  • Assertion (A): Graphite is a good conductor of electricity, however, diamond belongs to the category of insulators.

In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choices.
(a) Assertion and Reason both are correct statements and Reason is the correct explanation for Assertion.
(b) Assertion and Reason both are correct statements but Reason is not the correct explanation for Assertion.
(c) Assertion is correct but Reason is wrong.
(d) Assertion is wrong but Reason is correct.

Assertion (A): Graphite is a good conductor of electricity, however, diamond belongs to the category of insulators.
Reason (R): Graphite is soft in nature on the other hand diamond is very hard and brittle.

Answers (1)

The answer is the option (b)Assertion and reason both are correct statements but reason is not correct explanation for assertion.

 Diamond is a non-conductor of electricity because all valence electrons of carbon are involved in bonding and thus there is no delocalised electron in its structure. In graphite, one valence electron is free to move between adjacent layers making it a good conductor.
In Graphite, parallel layers are held together by week van der Waals force. That is why it is soft. However, diamond is hard since C atom is covalently bonded with the adjacent 3 carbon atoms forming a 3-dimensional network.

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