Question

In PO₄³⁻ ion, the formal charge on each oxygen atom and
P—O bond order respectively are
(a) –0.75, 0.6 (b) – 0.75, 1.0
(c) – 0.75, 1.25 (d) –3, 1.25

Answer 1

The formal charge on oxygen atom is - 0.75 and the bond order is 1.25

Option (C) is correct.

Explanation:

Formal charge on oxygen atom can be calculated as:

Formal charge = charge on ion / total number of atoms

Formal charge on oxygen atom =   −3 / 4  = −0.75

Bond order = Number of Bonds / Number of Resonating Structures

Bond order =  5 / 4 = 1.25

Thus the formal charge on oxygen atom is - 0.75 and the bond order is 1.25

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