Graphite is a good conductor of electricity due to the presence of __________.
(i) lone pair of electrons
(ii) free valence electrons
(iii) cations
(iv) anions
NCERT Class XII
Chemistry - Exemplar Problems
Chapter 1. Solid State
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answer is (ii)...................
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free valence electrons: 4 of them..
In the graphite crystal structure there are strong bonds between the neighbouring carbon atoms.. They are all quite well packed and arranged in a ring like structure.
There is one valence electron which can move from one atom to another. so that allows a good amount of electricity to pass through.
In Graphite the energy gap between the existing electron state and conduction band is ver y small. much smaller than for semiconductor and a little higher than metals.
In the graphite crystal structure there are strong bonds between the neighbouring carbon atoms.. They are all quite well packed and arranged in a ring like structure.
There is one valence electron which can move from one atom to another. so that allows a good amount of electricity to pass through.
In Graphite the energy gap between the existing electron state and conduction band is ver y small. much smaller than for semiconductor and a little higher than metals.
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