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What is the oxidation no. of phosphorus in H4P2O7 , H5P3O10, (HPO3)3 or pyrophosphoric acid, penta phosphoric acid, triphosphoric acid respectively ?

(a)  +4, +5, +3

(b)  +6, +5, +5

(c)  +5. +5, +5

(d)  +4, +5, +5 

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(c)   +5. +5, +5

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