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Select the correct statement(s).

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By Expert Faculty of Sri Chaitanya
a
The delocalised electrons in the n-orbitals of graphite  cause this allotropic form to conduct electricity
b
Pauling assigns "metallic valencies" equal to their group number to the elements of IA to VlA
c
Diatomic lithium molecules Li2 are stable towards dissociation
d
All of the above

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detailed solution

Correct option is D

In graphite each carbon atom is having one free electron. This free electron delocalises in its frame work making it as good conductor of electricity.For metallic bond formation every metal has to give valency electrons to sea or pool of electrons (Pauling theory) which is equal to it's group numberDi atomic Lithium has bond order 1 exists in gas phase and is stable
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Energy gaps between the highest filled band and the lowest empty bands in elements A,B,C and D are 0,70,530 and 110 kJ mol-1. Thus

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