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In phosphorus acid, if X is number of no...

In phosphorus acid, if X is number of non bonding electron pairs. Y is number of `sigma`-bonds and Z is number of `pi`- bonds. Then, calculate value of `Yxx Z -X`.

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The correct Answer is:
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`x=6 " " y=6 " " z=1`
`therefore y xx z - x=6xx1-6=0`
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