Question

Assertion (A): Phenolphthalein gives pink colour in alkaline medium
Reason (R): Phenolphthalein is a natural indicator

(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct
explanation of Assertion (A)

(b) Both Assertion (A) and Reason (R) are true and Reason (R) is not the correct
explanation of Assertion (A)

(c) Assertion (A) is true but Reason (R) is false

(d) Assertion (A) is false but Reason (R) is true

(e) Both Assertion (A) and Reason (R) are false​

Answer 1

Answer:(d) Assertion (A) is true but Reason (R) is false

Explanation:

Phenolphthalein is often used as an indicator in acid-base titrations. It will appear pink in basic solutions and clear in acidic solutions. ... Hence, phenolphthalein is chosen because it changes colour in a pH range between 8.3 – 10. But it is not a natural indicator.

Answer 2

Answer:

Answer is c Assertion is true but reason is false

Explanation:

phenolpthalein is not a natural indicator