Which of the following oxy-acids has the maximum number of hydrogens directly attached to phosphorus?
- $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7}$
- $\mathrm{H}_{3} \mathrm{PO}_{2}$
- $\mathrm{H}_{3} \mathrm{PO}_{3}$
- $\mathrm{H}_{3} \mathrm{PO}_{4}$
Asked in: JEE-TOPICTESTS-CHEMISTRY
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