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In PO4^3− ion, the formal charge on each oxygen atom and P—O bond order respectively are

1. -0.75, 0.6
2. -0.75, 1.0
3. -0.75, 1.25
4. -3, 1.25

Correct answer: -0.75, 1.25

Solution

In PO4^3−, the formal charge on each oxygen atom is -0.75 because the total charge (-3) is distributed among four oxygen atoms. The P—O bond order is 1.25 due to resonance involving one double bond and three single bonds averaged over four bonds.

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