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What is the product obtained in the determination of the percentage of nitrogen by ultimate analysis?

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What is the product obtained in the determination of the percentage of nitrogen by ultimate analysis?

(a) Nitrogen di-oxide

(b) Nitrogen oxide

(c) Ammonia

(d) Ammonium ion

I had been asked this question in class test.

The question is from Coal in division Fuels and Combustion of Engineering Chemistry II

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Right choice is (c) Ammonia

Explanation: The sample containing nitrogen is added to Kjeldahl flask, in which the nitrogen present is converted into the ammonium salts. The sample is then made alkaline with the help of alcoholic NaOH. Ammonia is liberated and is distilled into a measured amount of standard acid.

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