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Pyrophosphoric acid is prepared by heating of orthophosphoric acid. Which chemical formula through

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Pyrophosphoric acid is prepared by heating of orthophosphoric acid. Which chemical formula through the listed ones corresponds to pyrophosphoric acid?

А.  H2[HPO3]

B.  H4P2O7

C.  H3PO4

D.  H[H2PO2]

E.  HPO3 

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B.    H4P2O7 

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