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

Question

$\begin{array}{1 1} 3\% \\ 5\% \\ 6\% \\ 10\% \end{array}$