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Question

In $$ PO^{3 -}_4 $$ ion, the formal charge on each oxygen atom and $$ P - O $$ bond order respectively are

A
$$ - 0.75, 0.6 $$
B
$$ - 0.75 , 1.25 $$
C
$$ - 3, 1.25 $$
D
$$ -0.75 , 1.0 $$
Solution
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Correct option is A. $$ - 0.75 , 1.25 $$

Formal charge on each oxygen atom $$ = \cfrac { -3}{4} = -0.75 $$

Bond order = $$ \cfrac { total \ bonds}{ no \ of \ resonating \ structures} = \cfrac {5}{4} = 1.25 $$

Hence, Option "A" is the correct answer.

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