ফছফৰাছফছফ’প্ৰ’টিন
ফছফৰাছ এছিড (Assamese)
1. Phosphorous acid (or phosphonic acid) is the compound described by the formula H3PO3. This acid is diprotic (readily ionizes two protons), not triprotic as might be suggested by this formula. Phosphorous... from wikipedia.org