Question: The pair that contains two $\mathrm{P}-\mathrm{H}$ bonds in each of the oxoacids is :
$\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}$
$\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}$ and $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{6}$
$\mathrm{H}_{3} \mathrm{PO}_{3}$ and $\mathrm{H}_{3} \mathrm{PO}_{2}$
$\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}$ and $\mathrm{H}_{3} \mathrm{PO}_{3}$
Correct Option: 1,
Solution:
$\mathrm{H}_{3} \mathrm{PO}_{2}$ and $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}$
