Question

Assertion: A buffer has a definite pH value which changes, on keeping it or on diluting it.

Reason: A buffer solution is a mixture consisting of a weak acid and its conjugate base or vice versa.

• A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion
• B. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  
• C. Assertion is true but Reason is false
  
• D. Assertion is false but Reason is true

Answer 1

The correct option is B Both Assertion and Reason are true but Reason is not the correct explanation of Assertion

A buffer solutionis an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. Its pH changes very little when a small or moderate amount of strong acid or base is added to it and thus it is used to prevent changes in the pH of a solution. Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications. Many life forms thrive only in a relatively small pH range so they utilize a buffer solution to maintain a constant pH. One example of a buffer solution found in nature is blood.