Which of the following oxo-acids of sulphur has more than one oxidation state of sulphur?
A
H2S2O3
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B
H2S2O4
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C
H2S2O6
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D
H2S2O8
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Solution
The correct option is AH2S2O3 Thiosulphuric acid H2S2O3 has more than one oxidation state of sulphur. S=S linkage is present in thiosulphuric acid. One S atom has −2 oxidation state and other S atom has +6 oxidation state.