Which oxo acid of sulphur contains S-O-S bond?

• A

  $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_5$
• B

  $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_4$
• Correct answer
  C

  $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_7$
• D

  $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8$

Solution

The S-O-S bond is present in disulphuric or pyrosulphuric acid that has the formula $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_7$.

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