Question
Which acid is produced when sulphur dioxide reacts with water?
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Answer
When sulphur dioxide reacts with water then sulphurous acid $(\mathrm{H}_2 \mathrm{SO}_3)$ is produced.
$\mathrm{SO}_2+\mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{H}_2 \mathrm{SO}_3$
$\mathrm{SO}_2+\mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{H}_2 \mathrm{SO}_3$
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