Statement I : All oxo acids of phosphorous have P-OH bond

Statement II : All oxo acids of phosphorous have P=O bond

-O-H bond is responsible for basicity

No. of -OH bonds = Basicity

All Oxo acids must contain -OH bond

In all Oxo acids of 'P' , Phosphorous atom is surrounded by three $\mathrm{\sigma }$ (sigma) bonds

( P-H (or) P-OH (or) P-O-P (or) P-P) and one P=O

Thus each 'P' atom is surrounded by three single and one double bond