Pyrophosphorous acid \(\rightarrow H _{4} P _{2} O _{5}\).
Hypophosphoric acid \(\rightarrow H _{4} P _{2} O _{6}\)
Phosphoric acid \(\rightarrow H _{3} PO _{4}\)
Pyrophosphoric acid \(\rightarrow H _{4} P _{2} O _{7}\).
$(I)$ $XeF_6 +NaF \to Na^+ [XeF_7]^-$ $(II)$ $2PCl_5(s) \to [PCl_4]^+[PCl_6]^-$
$(III)$ $[Al(H_2O)_6]^{3+} + H_2O \to [Al(H_2O)_5OH]^{2+} + H_3O^+$
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