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What gas reacts with SO2 (sulfur dioxide) to form H2S2O7 (Disulfuric Acid)?

What gas reacts with SO2 (sulfur dioxide) to form H2S2O7 (Disulfuric Acid)?
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Answer #1

In industries general preparation method of oleum is as follows:

First step : combining of Sulfur and oxygen to form SO2 gas.

Second step : SO2 is converted to SO3 by reacting with O2 in presence of V2O5 catalyst under 450 0C and 1-2 atm pressure.

Third step : SO3 formed is added to H2SO4 to form Oleum(H2S2O7 (Disulfuric Acid).

Fourth step : The formed oleum then is added to water to form H2SO4, which is highly concentrated.

Answer : The gas that reacts with SO2 is O2.

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