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SO2 has acidic character. Explain....

`SO_2` has acidic character. Explain.

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It dissolves in water to form sulphurous acid. `SO_(2)(g) + H_(2)O(l) rarr H_(2)SO_(3)`(aq). So `SO_(2)` is regarded as anhydride of sulphurous acid. Its aqueous solution is acidic and turns blue litmus milky.
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