JEE Main · 2022 · 28 Jun 2022 · Shift 2 · p-Block Elements

Which of the following oxoacids of sulphur contains "S" in two different oxidation states?

(A) $H_{2} S_{2} O_{3}$ ✓ Correct
(B) $H_{2} S_{2} O_{6}$
(C) $H_{2} S_{2} O_{7}$
(D) $H_{2} S_{2} O_{8}$

Answer: (A)

Solution

H_{2} S_{2} O_{3}

(thiosulfuric acid), the structure shows two sulfur atoms in different oxidation states: one sulfur is in +6 oxidation state (bonded to three oxygens) and the other is in −2 oxidation state (replacing one oxygen). In

H_{2} S_{2} O_{6}

H_{2} S_{2} O_{7}

, and

H_{2} S_{2} O_{8}

, both sulfur atoms are in the same oxidation state (+5, +6, and +6 respectively). Therefore, only

H_{2} S_{2} O_{3}

has sulfur in two different oxidation states.

Structure H₂S₂O₃ structure — H₂S₂O₃ structure

Structure H₂S₂O₆ structure — H₂S₂O₆ structure

Structure H₂S₂O₇ structure — H₂S₂O₇ structure

Structure H₂S₂O₈ structure — H₂S₂O₈ structure

JEE Main · 2022 · 28 Jun 2022 · Shift 2 · Single correct option

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