Question

(A) In general phenolphthalein is used as an indicator for the titration of weak acid $\left(C{H}_{3}COOH\right)$ and strong base (NaOH).
(R) At equivalence point solution is basic.

• A. Both (R) and (A) are true and reason is the. correct explanation of assertion
• B. Both (R) and (A) are true but reason is not correct explanation of assertion
• C. Assertion (A) is true but reason (R) is false
• D. Assertion (A) and reason (R) both are false
• E. Assertion (A) is false but reason (R) is true

Answer 1

The correct option is A Both (R) and (A) are true and reason is the. correct explanation of assertion

If the titration is carried out for strong base and weak acid.At the end point the solution would be basic in nature .in this case phenolphthalein indicator.
So Phenolphthalein is used as an indicator for the titration of weak acid ($C{H}_{3}COOH$) and strong base ($NaOH$).Here the end point is basic in nature.

So Both (R) and (A) are true and reason is the. correct explanation of assertion.

Hence option A is correct.