Chemistry Equilibrium DUHS 2024
PMDC Verified Question 22 of 102
Conjugated acid \( \text{NH}_3 \) is
A
\( \text{NH}_4^+ \)
B
\( \text{NH} \)
C
\( \text{NH}_2^- \)
D
\( \text{NH}_2 \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: \( \text{NH}_4^+ \)
Concept:

According to the Brønsted-Lowry theory, a conjugate acid is formed when a base accepts a proton (\( \text{H}^+ \)).

Formula:

$$ \text{Base} + \text{H}^+ \rightleftharpoons \text{Conjugate Acid} $$

Solution:

  • Ammonia (\( \text{NH}_3 \)) acts as a weak base due to the lone pair of electrons on the nitrogen atom.


  • It accepts a hydrogen ion (\( \text{H}^+ \)) from an acid (like water or HCl).


  • Adding one Hydrogen atom and one positive charge yields the ammonium ion: \( \text{NH}_3 + \text{H}^+ = \text{NH}_4^+ \).


Why other options are incorrect:

\( \text{NH}_2^- \) is the conjugate base of ammonia (formed by losing a proton). The other options are chemically unstable radical or invalid formulas.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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