| List-$I$ Name of oxo acid | List-$II$ Oxidation state of $P$ |
| $(a)$ Hypophosphorous acid | $(i) +5$ |
| $(b)$ Orthophosphoric acid | $(ii) +4$ |
| $(c)$ Hypophosphoric acid | $(iii) +3$ |
| $(d)$ Orthophosphorous acid | $(iv) +2$ |
| $(v) +1$ |
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