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Conductor and Insulators

Graphite is a...

Question

Graphite is a conductor of electricity because

A

it has free valence electrons.

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B

it is a non-metal form of carbon.

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C

it is an allotrope of carbon.

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D

Both A and B.

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Solution

The correct option is A it has free valence electrons.
Graphite is a conductor of electricity because as can be seen in the crystal structure of graphite (in the figure) it has free valence electrons which can conduct electricity.
Graphite displays the property of both metal and non-metal. As a metal, graphite is a good conductor of electricity due to the mobility of electrons in outer valence shells.

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Q. Question 30
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous; non-sonorous; non-malleable and are coloured.
(a) Name a lustrous non-metal.
(b) Name a non-metal which exists as a liquid at room temperature.
(c) The allotropic form of a non-metal is a good conductor of electricity. Name the allotrope.
(d) Name a non-metal which is known to form the largest number of compounds.
(e) Name a non-metal other than carbon which shows allotropy.
(f) Name a non-metal which is required for combustion.

Q. Graphite is a good conductor of electricity because it has:

Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.

The allotropic form of a non-metal, which is a good conductor of electricity is:

Q. Graphite is the only non-metal which is a good conductor of electricity.

Q. Assertion :Among the carbon allotropes, diamond is an insulator, whereas, graphite is a good conductor of electricity. Reason: Hybridization of carbon in diamond and graphite is

{s p}^{3}

{s p}^{2}

, respectively.

Read the above assertion and reason and choose the correct option regarding it.

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