Assertion: Ammonia is a weak base.
Reason: Ammonia reacts with water to form ammonium ion and hydroxide ion.
Both assertion and reason are true, and the reason is the correct explanation of the assertion.
Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
The assertion is true, but the reason is false.
The assertion is false, but the reason is true.
Correct Option A
The Assertion is true. Ammonia is a weak base because it accepts protons from water to form ammonium ion
and hydroxide ion
. This reaction is represented as follows:
The Reason is also true and provides the correct explanation for the Assertion. When ammonia reacts with water, it produces ammonium ions and hydroxide ions. Ammonium ion can act as a weak acid and donate a proton, while the hydroxide ion acts as a weak base and accepts a proton. This process of proton exchange is known as the Bronsted-Lowry theory of acids and bases. Hence option A is the correct answer.
Option (B) is incorrect because it incorrectly states that the assertion is correct but the reason is incorrect. Both the assertion and reason are correct. Hence option B is incorrect.
Option (C) is incorrect because it incorrectly states that the assertion is incorrect but the reason is correct. The assertion is correct, and the reason is also correct. Hence option C is incorrect.
Option (D) is incorrect because it incorrectly states that both the assertion and reason are incorrect. Both the assertion and reason are correct. Hence option D is incorrect.