Question:
Assertion A: Pyridine is used in moisture determination using Karl Fischer reagent.
Reason R: \(I_{2}\) and \(SO_{2}\) react in presence of pyridine and water to form complex.
Assertion A: Pyridine is used in moisture determination using Karl Fischer reagent.
Reason R: \(I_{2}\) and \(SO_{2}\) react in presence of pyridine and water to form complex.
Reason R: \(I_{2}\) and \(SO_{2}\) react in presence of pyridine and water to form complex.
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Pyridine acts as both a buffer and a complexing agent in the Karl Fischer reaction.
Updated On: May 28, 2026
- Both A and R are correct and R is the correct explanation of A.
- Both A and R are correct but R is NOT the correct explanation of A.
- A is correct but R is not correct.
- A is not correct but R is correct.
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The Correct Option is A
Solution and Explanation
Step 1: Concept
Karl Fischer titration is the standard method for determining water content in a sample.
Step 2: Meaning
The reagent typically consists of Iodine ($I_2$), Sulfur dioxide ($SO_2$), a base (originally Pyridine), and an alcohol.
Step 3: Analysis
Assertion A is correct: Pyridine is used to neutralize the acids produced during the reaction. Reason R is also correct: Pyridine forms an intermediate complex with $SO_2$ and $I_2$, which then reacts with water. This complex formation is essential for the reaction to proceed quantitatively.
Step 4: Conclusion
Both statements are true, and the formation of the complex explains why pyridine is used.
Final Answer: (A)
Karl Fischer titration is the standard method for determining water content in a sample.
Step 2: Meaning
The reagent typically consists of Iodine ($I_2$), Sulfur dioxide ($SO_2$), a base (originally Pyridine), and an alcohol.
Step 3: Analysis
Assertion A is correct: Pyridine is used to neutralize the acids produced during the reaction. Reason R is also correct: Pyridine forms an intermediate complex with $SO_2$ and $I_2$, which then reacts with water. This complex formation is essential for the reaction to proceed quantitatively.
Step 4: Conclusion
Both statements are true, and the formation of the complex explains why pyridine is used.
Final Answer: (A)
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