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  • In PO{_{4}}^{3-} ion the formal charge on the oxygen atom of P-O bond is (i) + 1 (ii) – 1 (iii) – 0.75 (iv) + 0.75

In PO{_{4}}^{3-} ion the formal charge on the oxygen atom of P-O bond is
(i) + 1
(ii) – 1
(iii) – 0.75
(iv) + 0.75

Answers (1)

The answer is the option (ii) -1

Explanation: Formal charge in an atom of a polyatomic molecule or ion can also be defined as the difference between the number of valence electrons of that atom in an isolated or free state and the number of electrons assigned to that atom in the Lewis structure.

Formula:

The formal charge of the atom in the molecule or ion = (Number of the valence electron in the free atom) – (Number of lone pair electrons + ½ number of bonding electrons)

Therefore, the formal charge on each O-atom

= 6 – (6+ 1/2 × 2) = 6 – 7 = -1

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