How many bonds are present in the S-S bond in pyrosulphuric acid (oleum)?

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Solution

Oleum( $H_{2} S_{7} O_{2}$ ):
Oleum or sulfuric acid fuming is a solution of various sulfuric trioxide compounds in sulfuric acid or often called disulfuric acid also known as pyrosulfuric acid.
Pyrosulfuric acid is the main constituent of fuming sulfuric acid and is a strong acid.
The compounds contain 4 bonds.
Four oxygen atoms are linked to sulphur by double bonds and all others by a single bond.
Hence, there are zero S-S bonds in pyrosulphuric acid (oleum).

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