Question:
Which one among the following has the "S-O-S" bonding?
Which one among the following has the "S-O-S" bonding?
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Pyro acids are formed by condensation of two oxyacids with loss of water. Pyrosulfuric acid \((H_2S_2O_7)\) contains the characteristic \(S-O-S\) bridge.
Updated On: Jun 18, 2026
- \(H_2S_2O_5\)
- \(H_2S_2O_8\)
- \(H_2S_2O_7\)
- \(H_2S_2O_4\)
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The Correct Option is C
Solution and Explanation
Step 1: Recall the structure of pyrosulfuric acid.
\[ H_2S_2O_7 \] is called pyrosulfuric acid (oleum).
It is formed by the condensation of two sulfuric acid molecules. \[ 2H_2SO_4 \rightarrow H_2S_2O_7 + H_2O \]
Step 2: Examine the linkage present.
The structure of pyrosulfuric acid contains a bridging oxygen atom between two sulfur atoms. \[ S-O-S \] This linkage is known as a sulfur-oxygen-sulfur bridge.
Step 3: Compare with the other options.
\[ H_2S_2O_8 \] contains a peroxide linkage \[ -O-O- \] rather than an \(S-O-S\) bridge.
\[ H_2S_2O_5 \] and \[ H_2S_2O_4 \] do not contain the characteristic \(S-O-S\) linkage found in pyrosulfuric acid.
Step 4: Final conclusion.
Therefore, the compound containing \(S-O-S\) bonding is \[ \boxed{H_2S_2O_7} \] Hence, the correct option is (3).
\[ H_2S_2O_7 \] is called pyrosulfuric acid (oleum).
It is formed by the condensation of two sulfuric acid molecules. \[ 2H_2SO_4 \rightarrow H_2S_2O_7 + H_2O \]
Step 2: Examine the linkage present.
The structure of pyrosulfuric acid contains a bridging oxygen atom between two sulfur atoms. \[ S-O-S \] This linkage is known as a sulfur-oxygen-sulfur bridge.
Step 3: Compare with the other options.
\[ H_2S_2O_8 \] contains a peroxide linkage \[ -O-O- \] rather than an \(S-O-S\) bridge.
\[ H_2S_2O_5 \] and \[ H_2S_2O_4 \] do not contain the characteristic \(S-O-S\) linkage found in pyrosulfuric acid.
Step 4: Final conclusion.
Therefore, the compound containing \(S-O-S\) bonding is \[ \boxed{H_2S_2O_7} \] Hence, the correct option is (3).
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