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For the estimation of nitrogen , 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of $\;\large\frac{M}{10}\;$ sulphuric acid . The unreacted acid required 20 mL of $\;\large\frac{M}{10}\;$ sodium hydroxide for complete neutralization .The percentage of nitrogen in the compound is :

$(a)\;6 \%\qquad(b)\;10\%\qquad(c)\;3\%\qquad(d)\;5\%$

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