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  4. Oxidation state of phosphorus in pyrophosphoric acid is:

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Q. Oxidation state of phosphorus in pyrophosphoric acid is:

Jharkhand CECEJharkhand CECE 2006

Solution:

Pyrophosphoric acid is
$ \overset{+1}{H_{4}}\,\overset{x}{P_{2}}\,\overset{-2}{O_{7}}\, $
$ (+1\times 4)+2x+(-2\times 7)=0 $
$ +\,\,4+2x-14=0 $
$ 2x=14-4 $
$ 2x=10 $
$ x=+\,\,5 $