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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 $\large\frac{M}{10}$ sodiumhydroxideforcompleteneutralization.The percentage of nitrogen in the compound is:

$\begin{array}{1 1}(A)\;3\%\\(B)\;5\%\\(C)\;6\%\\(D)\;10\%\end{array} $

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