$\begin{array}{1 1} \text{Sulphurous acid can be is olated in the crystalline form } \\ \text{In alkaline solution reducing action of sulfurous acid is due to sulphition} \\ \text{In acidic solution , reducing action of sulphurous acid is due to } SO_2 \\ \text{The structure of sulphurus acid is tetrahedral including the lone pair of electrons on sulphur} \end{array} $
