Assertion :Dumas method is more applicable to nitrogen containing organic compounds than Kjeldahl's method. Reason: Kjeldahl's method does not give satisfactory results for compounds in which N is linked to O atom.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
The Dumas method has the advantages of being easy to use and automated. It is also considerably faster than the Kjeldahl method, taking a few minutes per measurement, as compared to the hour or more for Kjeldahl. Kjeldahl method is not applicable to compounds containing nitrogen in nitro and azo groups and nitrogen present in rings (e.g. pyridine) as nitrogen of these compounds does not convert to ammonium sulfate under the conditions of this method.

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