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What is the correct formula for sulfuric acid?

H2SO3
H2SO4
H2S
H2SO2

The correct answer is: H2SO4

Sulfuric acid has the chemical formula H2SO4. Option A, H2SO3, represents sulfurous acid. Option C, H2S, represents hydrogen sulfide which is a compound with two elements, hydrogen and sulfur, but does not refer to sulfuric acid specifically. Option D, H2SO2, represents sulfurous acid, which is incorrect as mentioned earlier.