Which one of the following is not correct

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Formal charge of each atom of polyatomic ion can be calculated

Formal charges help in the selection of the lowest energy structure of molecule

Formal charges indicate real charge separation within the molecule.

Number of unshared electrons on the atom is also considered for calculation of formal charge.

answer is C.

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Detailed Solution

The formal charge being a theoretical charge doesn’t indicate any real charge separation in the molecule.
Formal charges help in the selection of the lowest energy structure from a number of possible Lewis structures for a given species.

“The formal charge over an atom of a polyatomic molecule or ion is the difference between the valence electron of that atom in the elemental state and the number of electrons assigned to that atom in Lewis structure.”

F.C. = [Total no. of valence e^– in the free state] – [total no. of non-bonding pair e^– (lone pair)] – 1/2 [total no. of bonding e–]

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