Both A and R are true and R is the correct explanation of A
Both A and R are true but R is NOT the correct explanation of A
A is true but R is false
A is false but R is true
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The Correct Option isA
Solution and Explanation
Let's analyze the given assertion and reason to determine the correct answer:
Assertion A: Permanganate titrations are not performed in presence of hydrochloric acid.
Reason R: Chlorine is formed as a consequence of oxidation of hydrochloric acid.
Understanding Permanganate Titrations:
Permanganate titrations often involve the use of a strong oxidizing agent, potassium permanganate, \text{KMnO}_4. They are typically carried out in acidic conditions using sulfuric acid, but not hydrochloric acid.
Role of Hydrochloric Acid:
Hydrochloric acid is generally avoided in these titrations because it can be oxidized to chlorine gas by permanganate ions. The reaction can be represented as: \text{2KMnO}_4 + 16\text{HCl} \rightarrow 2\text{KCl} + 2\text{MnCl}_2 + 5\text{Cl}_2 + 8\text{H}_2\text{O}
Examination of Assertion and Reason:
Assertion A is true because using hydrochloric acid in permanganate titrations can lead to unintended side reactions, such as the formation of Cl2 gas, complicating the procedure.
Reason R is true because, indeed, chlorine gas is formed as a result of hydrochloric acid oxidation in the presence of a strong oxidizing agent like \text{KMnO}_4.
Additionally, Reason R directly explains Assertion A, because it explicitly states the issue with using hydrochloric acid: the generation of chlorine, making Reason R a correct explanation of Assertion A.
Conclusion:
Since both the assertion and reason are true, and Reason R correctly explains Assertion A, the correct answer is:
"Both A and R are true and R is the correct explanation of A."
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