Select the pair of substances in which an acid is listed followed by its conjugate base. a) h+, hclb) nh3, nh4+c) hpo42-, h2po4-d) hco3-, co32-e) ch3cooh, ch3cooh2+

The pair of substances in which an acid is listed followed by its conjugate base - D) HCO₃⁻, CO₃²⁻

According to Brønsted–Lowry's definition of acids and bases, a conjugate acid-base pair consists of two substances that differ only by the presence of a proton (H⁺).

base + H⁺> conjugate acid

acid> conjugate base + H⁺

For the given option:

Option D.

     acid                            conjugate base

Option A.

no acid-base pair here

Option B.

C. ammonia (NH3) acting as a base

Option C.

. hydrogen phosphate acting as a base

Option E.

Acetic acid (CH3COOH) is accepting H⁺ base, and CH₃COOH₂⁺ is its conjugate acid

Thus, the pair of substances in which an acid is listed followed by its conjugate base - D) HCO3-, CO32-

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