AIIMS 2019 Chemistry Bronsted-Lowry Theory MCQ Question
Assertion: shows atmospheric nature.
Reason: According to Bronsted theory, it acts as acid with and a base with .
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
In the provided reactions, water (H₂O) acts as both an acid and a base according to the Brønsted-Lowry theory. In the first reaction, H₂O donates a proton (H⁺) to ammonia (NH₃), forming ammonium (NH₄⁺) and hydroxide (OH⁻), demonstrating its role as an acid. Conversely, in the second reaction, H₂O accepts a proton from hydrogen sulfide (H₂S), producing hydronium (H₃O⁺) and hydrosulfide (HS⁻), showcasing its behavior as a base. Since the question focuses on the dual role of water, option A correctly encapsulates this concept, while the other options are not applicable as they do not provide relevant information.
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