####110. Give structural formula for the following.
(i) Phosphorous acid, $H _3 PO _3$
(ii) Pyrophosphoric acid, $H _4 P _2 O _7$
$(1981,2 M)$
110.
orthophosphorus acid (only two acidic $H, H$ directly bonded to $P$ is not acidic)
(ii)
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