Question

The \( {S} - {S} \) bond is not present in:

• A. \( {S}_2{O}_4^{2-} \)
• B. \( {S}_2{O}_5^{2-} \)
• C. \( {S}_2{O}_3^{2-} \)
• D. \( {S}_2{O}_7^{2-} \)

Hint:

When dealing with sulfur oxyanions, check the bonding between sulfur atoms. Some species have sulfur-sulfur bonds, while others have sulfur-oxygen-sulfur linkages.

Answer 1

The Correct Option is D

Step 1: The \( {S} - {S} \) bond occurs when two sulfur atoms are directly bonded to each other in a compound. 
Step 2: In \( {S}_2{O}_4^{2-} \), \( {S}_2{O}_5^{2-} \), and \( {S}_2{O}_3^{2-} \), there are \( {S} - {S} \) bonds present between sulfur atoms. 
Step 3: In \( {S}_2{O}_7^{2-} \), there is no direct \( {S} - {S} \) bond. The two sulfur atoms are connected through an oxygen bridge, meaning there is no direct bonding between sulfur atoms. 
Thus, the correct answer is option (D).