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Q.

Count the total number of unshared valence electrons on $I_{3}^{-} = x$
Count the total number of $p π - d π$ bonds in ${PO}_{4}^{3 -} = y$
Count the total number of lone pairs in ${XeF}_{4} = z$
Hence, find the value of $x - z - y$

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answer is 3.

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Detailed Solution

The values of x,y and z are,

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Thus,

$x - z - y = 18 - 14 - 1 = 3$

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Count the total number of unshared valence electrons on I3−=xCount the total number of pπ−dπ bonds in PO43−=yCount the total number of lone pairs in XeF4=zHence, find the value of x−z−y