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Identify the correct formula of ‘oleum’ from the following.

1. H2S2O8
2. H2S2O7
3. H2SO3
4. H2SO4

Correct answer: H2S2O7

Solution

Oleum is also known as fuming sulfuric acid and has the chemical formula H2S2O7, which is a mixture of sulfuric acid and sulfur trioxide.

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