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  4. In PO43- , the formal charge on each oxygen atom and the P - O bond order respectively are

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Q. In $PO_4^{3-} ,$ the formal charge on each oxygen atom and the $P - O$ bond order respectively are

BITSATBITSAT 2016

Solution:

Bond order $=\frac{\text { Number of bonds }}{\text { Number of Resonating structures }} $
$=\frac{5}{4}=1.25$
Three unit negative charge is being shared by four $O$ atoms.
Formal charge $=-3 / 4$

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