In the reaction HSO₄⁻(aq)+OH⁻(aq) ⇌ SO₄²⁻(aq)+H₂ O(), the conjugate acid-base pairs are · ABC26IN0446

Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Element – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Medium

In the reaction $\mathrm{HSO}_{4}^{-}(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq}) \rightleftharpoons \mathrm{SO}_{4}^{2-}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\ell)$, the conjugate acid-base pairs are
(a)$\mathrm{HSO}_{4}^{-}$and $\mathrm{SO}_{4}^{2-} ; \mathrm{H}_{2} \mathrm{O}$ and $\mathrm{OH}^{-}$
(b)$\mathrm{HSO}_{4}^{-}$and $\mathrm{H}_{3} \mathrm{O}^{+} ; \mathrm{SO}_{4}^{2-}$ and $\mathrm{OH}^{-}$
(c)$\mathrm{HSO}_{4}^{-}$and $\mathrm{OH}^{-} ; \mathrm{SO}_{4}^{2-} ; \mathrm{H}_{2} \mathrm{O}$
(d)$\mathrm{HSO}_{4}^{-}$and $\mathrm{OH}^{-} ; \mathrm{SO}_{4}^{2-}$ and $\mathrm{H}_{3} \mathrm{O}^{+}$
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
HSO₄⁻ (acid) loses H⁺ to give SO₄²⁻ (its conjugate base); OH⁻ (base) gains H⁺ to give H₂O (its conjugate acid). Pairs: HSO₄⁻/SO₄²⁻ and H₂O/OH⁻.

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