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B. H₃O⁺ , OH⁻ is not a conjugate acid-base pair.
The acid-base pair which differs by a single proton is called as a conjugate acid-base pair.
Since, H₃O⁺ and OH⁻ differs not by a single proton, they aren't considered as a conjugate acid-base pair.
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The correct option is (A) HS-,S²