Question

Which of the following oxyacid of sulphur contain both S=S and S=O bonds ?

• A. $\mathrm{H_2S_2O_5}$
• B. $\mathrm{H_2S_2O_4}$
• C. $\mathrm{H_2S_2O_2}$
• D. $\mathrm{H_2S_2O_3}$

Hint:

Thiosulphuric acid is unique among sulphur oxyacids due to the presence of both S=S and S=O bonds.

Answer 1

The Correct Option is D

Step 1: Structure of oxyacids of sulphur.
Different oxyacids of sulphur show different bonding patterns involving sulphur–sulphur and sulphur–oxygen bonds.

Step 2: Analysis of thiosulphuric acid.
Thiosulphuric acid $\mathrm{(H_2S_2O_3)}$ contains one sulphur atom bonded to another sulphur atom through an S=S bond and also contains S=O bonds.

Step 3: Elimination of other options.
Other given oxyacids do not simultaneously contain both S=S and S=O bonds.

Step 4: Conclusion.
Therefore, the correct answer is $\mathrm{H_2S_2O_3$}.