Consider the following reaction: $$ \mathrm{NH}_{4}^{+}+\mathrm{CN}^{\cdot} \Leftrightarrow \mathrm{NH}_{3}+\mathrm{HCN} $$ Which pair of substances represents a conjugate acid-base pair? Select all that apply. (A) $$ \mathrm{NH}_{4}+ $$ and CN - (B) $$ \mathrm{NH}_{3} $$ and HCN (D) $$ \mathrm{NH} 4+ $$ and NH 3 and HCN

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To identify conjugate acid-base pairs, we need to recognize that a conjugate acid-base pair consists of an acid and its corresponding base, which differ by a proton (H⁺).

In the given reaction:

$$
\mathrm{NH}_{4}^{+} + \mathrm{CN}^{\cdot} \Leftrightarrow \mathrm{NH}_{3} + \mathrm{HCN}
$$

1. **(A) $$ \mathrm{NH}_{4}^{+} $$ and $$ \mathrm{CN}^{-} $$**: This pair does not represent a conjugate acid-base pair. $$ \mathrm{NH}_{4}^{+} $$ is an acid, but $$ \mathrm{CN}^{-} $$ is not the conjugate base of $$ \mathrm{NH}_{4}^{+} $$.

2. **(B) $$ \mathrm{NH}_{3} $$ and $$ \mathrm{HCN} $$**: This pair does represent a conjugate acid-base pair. $$ \mathrm{NH}_{3} $$ can accept a proton to become $$ \mathrm{NH}_{4}^{+} $$ (making it a base), and $$ \mathrm{HCN} $$ can donate a proton to become $$ \mathrm{CN}^{-} $$ (making it an acid).

3. **(C) $$ \mathrm{NH}_{4}^{+} $$ and $$ \mathrm{NH}_{3} $$**: This pair does represent a conjugate acid-base pair. $$ \mathrm{NH}_{4}^{+} $$ is the conjugate acid of $$ \mathrm{NH}_{3} $$, which is the conjugate base.

4. **(D) $$ \mathrm{HCN} $$ and $$ \mathrm{CN}^{-} $$**: This pair also represents a conjugate acid-base pair. $$ \mathrm{HCN} $$ is the conjugate acid of $$ \mathrm{CN}^{-} $$, which is the conjugate base.

Thus, the pairs that represent conjugate acid-base pairs are:

- (B) $$ \mathrm{NH}_{3} $$ and $$ \mathrm{HCN} $$
- (C) $$ \mathrm{NH}_{4}^{+} $$ and $$ \mathrm{NH}_{3} $$
- (D) $$ \mathrm{HCN} $$ and $$ \mathrm{CN}^{-} $$

So the correct answers are (B), (C), and (D).
The correct pairs are (B) $$ \mathrm{NH}_{3} $$ and $$ \mathrm{HCN} $$, (C) $$ \mathrm{NH}_{4}^{+} $$ and $$ \mathrm{NH}_{3} $$, and (D) $$ \mathrm{HCN} $$ and $$ \mathrm{CN}^{-} $$.

Consider the following reaction:

Which pair of substances represents a conjugate acid-base pair? Select all that apply.
(A) and CN -
(B) and HCN
(D) and NH 3
and HCN

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Consider the following reaction: Which pair of substances represents a conjugate acid-base pair? Select all that apply. (A) and CN - (B) and HCN (D) and NH 3 and HCN