The oxoacid of sulphur which contains two sulphur atoms in different oxidation states is

• Correct answer
  A

  pyrosulphurous acid
• B

  hyposulphurous acid
• C

  pyrosulphuric acid
• D

  persulphuric acid

Solution

The structure of the given oxoacids of sulphur are as
Thus, the oxidation states of two $S$ atoms in pyrosulphurous acid are different.

Hence, the correct answer is option: 'A'.