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For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldhal method and the evolved ammonia was absorbed in 60 mL of 10 M sulphuric acid. The unreacted acid required 20 mL of 10 M sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is -

1. 10%
2. 3%
3. 5%
4. 6%

Correct answer: 10%

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