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What is the formula to sulfurous acid? H2S. HSO4. H2SO4. H2SO3.
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What is the formula to sulfurous acid? H2S. HSO4. H2SO4. H2SO3.

User Zhiyuan Sun
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H2SO3 is the correct answer
User Sachintha Udara
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Sulfurous acid a chemical compound and its formula  is H₂SO₃.
User Jarretinha
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