(i) Phosphorous acid, $\mathrm{H}{3} \mathrm{PO}{3}$
(ii) Pyrophosphoric acid, $\mathrm{H}{4} \mathrm{P}{2} \mathrm{O}_{7}$
$(1981,2 M)$
110.
orthophosphorus acid (only two acidic $\mathrm{H}, \mathrm{H}$ directly bonded to $\mathrm{P}$ is not acidic)
(ii)
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