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Q81
(NDA-I/2026)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Consider the following statement :
"Acids are substances that dissociate in water to give hydrogen ions H+ (aq), and bases are substances that produce hydroxyl ions OH- (aq)."
The above statement is based on which one of the following concepts?
Result
Your answer:
—
·
Correct:
C
Explanation
The statement provided is the definition of the Arrhenius concept of acids and bases. Proposed by Svante Arrhenius in 1884, this theory defines an acid as a substance that increases the concentration of hydrogen ions (H+) when dissolved in water, and a base as a substance that increases the concentration of hydroxyl ions (OH-) in aqueous solution.
- Brønsted-Lowry concept: Defines acids as proton (H+) donors and bases as proton acceptors, regardless of the solvent.
- Lewis concept: Defines acids as electron-pair acceptors and bases as electron-pair donors.
- Conjugate acid-base concept: Part of the Brønsted-Lowry theory, referring to pairs that differ by a single proton.
The Arrhenius definition is specifically tied to the production of H+ and OH- ions in aqueous (water) environments.
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