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Assertion (A) . Sulphur present in an or...

Assertion (A) . Sulphur present in an organic compound can be estimated quantitaively be Carius method.
Reason (R). Sulpur is separated easily from other atoms in the molecule and gets precipitated as light yellow solid.

A

Both A and R are correct and R is the correct explanation of A

B

Both A and R are correct but R is not the correct explanation of As

C

both A and R are not correct

D

A is not correct but R is correct

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Assertion**: The assertion states that sulfur present in an organic compound can be estimated quantitatively using the Carius method. This method is indeed used for determining the amount of sulfur in organic compounds. 2. **Understanding the Reason**: The reason provided is that sulfur is separated easily from other atoms in the molecule and gets precipitated as a light yellow solid. This is where we need to analyze the accuracy of the statement. 3. **Carius Method Explanation**: In the Carius method, a known weight of the organic compound is heated in the presence of fuming nitric acid (HNO3). If sulfur is present, it gets converted to sulfuric acid (H2SO4). 4. **Formation of Precipitate**: When barium chloride (BaCl2) is added to the solution containing sulfuric acid, barium sulfate (BaSO4) is formed as a precipitate. This precipitate is light yellow in color, which can sometimes be misleading. 5. **Clarifying the Reason**: The light yellow color of the precipitate is due to impurities, not because sulfur is easily separated from other atoms. Therefore, the reason given in the question is incorrect. 6. **Conclusion**: The assertion is correct because sulfur can be quantitatively estimated using the Carius method. However, the reason is incorrect as it misrepresents the nature of the precipitate formed. 7. **Final Answer**: The assertion (A) is true, and the reason (R) is false. Therefore, the correct option is that the assertion is correct, but the reason is not.
### Step-by-Step Solution: 1. **Understanding the Assertion**: The assertion states that sulfur present in an organic compound can be estimated quantitatively using the Carius method. This method is indeed used for determining the amount of sulfur in organic compounds. 2. **Understanding the Reason**: The reason provided is that sulfur is separated easily from other atoms in the molecule and gets precipitated as a light yellow solid. This is where we need to analyze the accuracy of the statement. 3. **Carius Method Explanation**: In the Carius method, a known weight of the organic compound is heated in the presence of fuming nitric acid (HNO3). If sulfur is present, it gets converted to sulfuric acid (H2SO4). ...
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