The total number of compounds having at least one bridging oxo group among the molecules given below

Question

The total number of compounds having at least one bridging oxo group among the molecules given below is ______ .\ $\mathrm{N}_{2} \mathrm{O}_{3}, \mathrm{~N}_{2} \mathrm{O}_{5}, \mathrm{P}_{4} \mathrm{O}_{6}, \mathrm{P}_{4} \mathrm{O}_{7}, \mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}, \mathrm{H}_{5} \mathrm{P}_{3} \mathrm{O}_{10}, \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$, $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{5}$\

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