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Oxyacids of Phosphorus

In PO 4 3- ...

Question

In ${P O}_{4}^{3 -}$ ion the formal charge on the oxygen atom of P-O bond is:

A

1

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B

-1

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C

-0.75

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D

0.75

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Solution

The correct option is D -0.75
Formal charge on an atom $=$ total no. of values electron no. of lone pair $+ \frac{1}{2}$ ( bonding electrons )
Formal charge on oxygen $= 6 - [6 + \frac{1 (2)}{2 \times 2}]$
$= 6 - 7$
$= - 1$
We know that there are $3$ oxygen having charge than formal charge will be $- 1 \times 3 = - 3$
Now the formal charge on oxygen $= - 3 / 4 = - 0.75$

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