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$SO_2+H_2O\rightarrow H_2SO_3$. $\quad H_2SO_3$ is also known as

$\begin{array}{1 1}(a)\;Sulphuric\;acid\\(b)\;Sulphurous\;acid\\(c)\;Hydro\;sulphuric\;acid\\(d)\;Hypo\;sulphuric\;acid\end{array}$

1 Answer

Sulphurous acid is the strong acid produced by dissolving sulphur dioxide in water.
$SO_2+H_2O\rightarrow H_2SO_3$
Sulphurous acid, $H_2SO_3$, is a weak dibasic acid, known in the form of its salts (e.g. sodium sulphite).
Hence (b) is the correct answer.
answered Jan 21, 2014 by sreemathi.v
edited Mar 29, 2014 by mosymeow_1