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(a). IF both (A) and (R) are correct and...

(a). IF both (A) and (R) are correct and (R) is the correct explanation of (A).
(b). If both (A) and (R) are correct but (R) is not the correct explanation of (A).
(c). If (A) is correct, but (R) is incorrect.
(d). If (A) is incorrect, but (R) is correct. ltbr. (e) if both (A) and (R) are incorrect.
Q. Assertion (A): In the titration of strong acid and strong base, phenolphthalein is used as suitable indocator.
Reason (R): IN the titration of strong acid and strong base, the equivalence points lies is the pH range of `(3.0-10.5)` and phenolphthalein have pH range of `(8.0-9.8)`.

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To solve the question, we need to analyze the assertion (A) and the reason (R) given in the problem: **Assertion (A):** In the titration of strong acid and strong base, phenolphthalein is used as a suitable indicator. **Reason (R):** In the titration of strong acid and strong base, the equivalence point lies in the pH range of (3.0-10.5) and phenolphthalein has a pH range of (8.0-9.8). ### Step-by-Step Solution: 1. **Understanding the Assertion (A):** - Phenolphthalein is indeed a suitable indicator for titrations involving strong acids and strong bases. It changes color in the pH range of approximately 8.0 to 9.8, which is appropriate for detecting the endpoint of such titrations. **Hint:** Recall the pH range of phenolphthalein and its function as an indicator. 2. **Understanding the Reason (R):** - The equivalence point in a titration of a strong acid with a strong base typically occurs around pH 7. However, the reason states that the equivalence point lies between pH 3.0 and 10.5. This range is indeed correct, as it encompasses the pH at which neutralization occurs (around pH 7) and the pH values that can be observed during the titration. **Hint:** Consider the nature of strong acid-strong base reactions and their equivalence points. 3. **Evaluating the Relationship Between (A) and (R):** - Both the assertion and the reason are correct statements. The assertion correctly identifies phenolphthalein as a suitable indicator, and the reason correctly describes the pH range of the equivalence point for the titration of strong acids and strong bases. **Hint:** Determine if the reason provides a valid explanation for the assertion. 4. **Conclusion:** - Since both (A) and (R) are correct and (R) provides the correct explanation for (A), the correct answer is: - **(a)** If both (A) and (R) are correct and (R) is the correct explanation of (A). ### Final Answer: (a) If both (A) and (R) are correct and (R) is the correct explanation of (A). ---
To solve the question, we need to analyze the assertion (A) and the reason (R) given in the problem: **Assertion (A):** In the titration of strong acid and strong base, phenolphthalein is used as a suitable indicator. **Reason (R):** In the titration of strong acid and strong base, the equivalence point lies in the pH range of (3.0-10.5) and phenolphthalein has a pH range of (8.0-9.8). ### Step-by-Step Solution: ...
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