AIIMS 2017 Chemistry Buffer Solutions Assertion Reason Question
Assertion (A): Buffer solution are composed of strong acids and strong bases.
Reason (R): It maintain the pH to a constant value of 7.4.
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
Option B is correct because while the assertion that buffer solutions are composed of a mixture of a weak acid and its conjugate base is true, the statement about strong base and its conjugate acid is incorrect; buffers typically consist of weak acids and their conjugate bases or weak bases and their conjugate acids. The reason provided is also true, as buffer solutions do resist changes in pH, but it does not correctly explain the assertion since the assertion inaccurately describes the components of a buffer. Options A and C are incorrect because they suggest that both statements are correct or that the assertion is correct while the reason is not, which is not the case. Option D is incorrect as it dismisses the validity of both statements.
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