Consider the following statements regarding the compounds of sulfur: I. In H 2 SO 4 , the oxidation state of sulfur is + 6 and it is a dibasic acid. II. In H 2 S 2 O 7 , the oxidation state

Question

Consider the following statements regarding the compounds of sulfur:

I. In $H_{2} SO_{4}$ , the oxidation state of sulfur is $+ 6$ and it is a dibasic acid.

II. In $H_{2} S_{2} O_{7}$ , the oxidation state of sulfur is $+ 6$ and it contains an $S-S$ bond.

III. The average oxidation state of sulfur in $H_{2} S_{2} O_{3}$ is $+ 2$ , and it can disproportionate.

IV. $H_{2} SO_{5}$ (Caro's acid) contains one $S-O-S$ linkage and one $O-O$ linkage.

Which of the above statements are INCORRECT?

TestHub · Accepted Answer

I. H₂SO₄: S oxidation state is + 6 ( 2 ( + 1 ) + S + 4 ( − 2 ) = 0 ). It's dibasic. (Correct) II. H₂S₂O₇ (oleum): S oxidation state is + 6 . Structure is HO-S(=O)₂-O-S(=O)₂-OH, containing S-O-S, not S-S. (Incorrect) III. H₂S₂O₃ (thiosulfuric acid): Average S oxidation state is + 2 ( 2 ( + 1 ) + 2 S + 3 ( − 2 ) = 0 ). It disproportionates. (Correct) IV. H₂SO₅ (Caro's acid): Structure is HO-S(=O)₂-O-OH. Contains O-O (peroxide) linkage, but no S-O-S linkage. (Incorrect) Statements II and IV are incorrect.

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