Question:
In which of the following pairs of chemical species does sulfur (S) not have the same oxidation number?
In which of the following pairs of chemical species does sulfur (S) not have the same oxidation number?
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To determine the oxidation number, balance the total charge of the molecule or ion with the known oxidation states of other atoms.
Updated On: Feb 20, 2026
- S2 and H2S
- H2SO3 and SO2
- HS− and S2−
- H2S and S2−
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The Correct Option is B
Solution and Explanation
The oxidation numbers of sulfur in the given species are:
- S2 (0) and H2S (−2) – Different oxidation numbers.
- H2SO3 (+4) and SO2 (+4) – Same oxidation numbers.
- HS− (−1) and S2− (−2) – Different oxidation numbers.
- H2S (−2) and S22− (−1) – Different oxidation numbers.
Thus, sulfur does not have the same oxidation number in the pairs H2SO3 and SO2, and HS− and S2−.
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