$\mathrm{S}_2 \mathrm{O}_8{ }^{2-}$ have

• A

  S-S bond
• B

  S-O bridge
• Correct answer
  C

  O–O bridge
• D

  All S–O bond lengths are same.

Solution

The structure of peroxodisulfate anion is:
It has a $\mathrm{O}-\mathrm{O}$ bridge.

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