Consider the following sulphur based oxoacids. H SO , H SO , H S O and H S O . Amongst these oxoacid — p Block Elements Chemistry Question
Question
Consider the following sulphur based oxoacids. H SO , H SO , H S O and H S O . Amongst these oxoacids, the number of those with peroxo(O-O) bond is______. 2 3 2 4 2 2 8 2 2 7
💡 Solution & Explanation
**Step 1: Identify the structures of each oxoacid.** - **H₂SO₃** (sulfurous acid): S in +4 oxidation state with S-O and S=O bonds; no peroxo bond - **H₂SO₄** (sulfuric acid): S in +6 oxidation state with S-O and S=O bonds; no peroxo bond - **H₂S₂O₈** (peroxodisulfuric acid): Contains S in +6 oxidation state with an **O-O peroxo bond** connecting two sulfate units - **H₂S₂O₇** (pyrosulfuric acid): Two SO₃ units linked by an S-O-S bridge; no peroxo bond **Step 2: Recognize the peroxo bond characteristic.** A peroxo bond is an O-O single bond where oxygen is in the -1 oxidation state (in a peroxide group). **Step 3: Verify H₂S₂O₈ structure.** H₂S₂O₈ has the structural formula: HO-SO₂-O-O-SO₂-OH The O-O bond in the middle is the peroxo group, characteristic of peroxodisulfuric acid. **Step 4: Count acids with peroxo bonds.** Only **H₂S₂O₈** contains the O-O peroxo bond. The other three acids (H₂SO₃, H₂SO₄, H₂S₂O₇) lack peroxo bonds. Therefore, the answer is **1.00**.