Question:
As per Bronsted-Lowry concept, acid is defined as:
As per Bronsted-Lowry concept, acid is defined as:
Updated On: Jul 14, 2026
- Electron pair acceptor
- Any substance/molecule that can accept a proton
- Any substance/molecule that can donate a proton
- Electron pair donor
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The Correct Option is C
Approach Solution - 1
The correct option is (C): Any substance/molecule that can donate a proton
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Approach Solution -2
The Bronsted-Lowry theory defines acids and bases purely in terms of proton (H+) transfer, which is different from the Lewis theory that defines them in terms of electron pairs. Each option can be checked against the Bronsted-Lowry definition specifically:
- Electron pair acceptor: This is the Lewis definition of an acid, not the Bronsted-Lowry definition, so it does not answer what the question asks.
- Any substance/molecule that can accept a proton: Accepting a proton is how the Bronsted-Lowry theory defines a base, not an acid, so this option describes the opposite species.
- Any substance/molecule that can donate a proton: This is precisely the Bronsted-Lowry definition of an acid, a species that gives up an H+ ion to another species in the reaction.
- Electron pair donor: This describes a Lewis base, which again belongs to a different theory and a different species altogether.
Since the Bronsted-Lowry concept is specifically built around proton transfer, and donating that proton is what makes a species act as an acid in this theory, only one option matches.
Therefore, the correct answer is Any substance/molecule that can donate a proton.
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