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The chemical formula of phosphoric acid is H3PO4.
Let the oxidation state of phosphorous in phosphoric acid be x.
Since it the molecule does not carry any net charge,
+1x3 + x – 2x4 = 0 [ Oxidation state of H is +1 and oxidation state of O is -2 ]
=> 3+x-8 = 0
=> x-5 = 0
=> x = 5
Hence, the oxidation state of phosphorous in Phosphoric acid is +5.
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