In a molecule of pyrophosphoric acid $(H_4P_2O_7)$,the number of $P-OH$,$P=O$ and $P-O-P$ bonds/moiety(ies) respectively are:
- A$3, 3$ and $3$
- B$2, 4$ and $1$
- C$4, 2$ and $0$
- D$4, 2$ and $1$
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