Chemistry Equilibrium MDCAT 2013
PMDC Verified Question 97 of 102
The chemical substance, when dissolved in water, gives "\( \text{H}^+ \)" is called:
A
Neutral
B
Base
C
Acid
D
Amphoteric
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Acid
Concept:

The classical Arrhenius definition classifies compounds based on the ions they yield in an aqueous solution.

Formula:

$$ \text{HA}_{(aq)} \rightarrow \text{H}^+_{(aq)} + \text{A}^-_{(aq)} $$

Solution:

  • According to Arrhenius theory, an acid is a substance that ionizes in water to yield hydrogen ions (\( \text{H}^+ \)).


  • For example, \( \text{HCl} \) dissolves in water to form \( \text{H}^+ \) and \( \text{Cl}^- \).


Why other options are incorrect:

A base yields hydroxide ions (\( \text{OH}^- \)) in water. Neutral substances yield neither in excess. Amphoteric substances can act as both acids and bases depending on the environment.

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