In a molecule of pyrophosphoric acid, the number of $P$ $\mathrm{OH}, \mathrm{P}=\mathrm{O}$ and $\mathrm{P}-\mathrm{O}-\mathrm{P}$ bonds/ moiety(ies) respectivel are:
2,4 and 1
3,3 and 3
4,2 and 0
4,2 and 1
Correct Option: , 4
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