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# How many bonds are present in $S - S$ bonds in pyrosulphuric acid (oleum)?

Last updated date: 26th Mar 2023
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Hint: Pyrosulphuric acid or disulfuric acid is the main constituent of fuming sulfuric acid. It is a solution of sulfur trioxide $(S{O_3})$ in anhydrous sulfuric acid. Pyrosulphuric acid is a colourless liquid that fumes in moist air due to the reaction between $S{O_3}$ and ${H_2}O$, which leads to the formation of poorly volatile ${H_2}S{O_4}$. It is also used for sulfation of organic compounds.

We can determine the number of $S - S$ bonds present in pyrosulfuric acid (oleum) by taking a look at its structure.
From the above structure we can easily figure out that there are no $S - S$ bonds present in oleum.
Therefore, the number of bonds present in $S - S$ bonds in pyrosulfuric acid (oleum) is zero.