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JEE Main & Advanced AIEEE Solved Paper-2010

  • question_answer
      29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in 20 mL of\[0.1\text{ }M\text{ }HCl\]solution. The excess of the acid required 15 mL of 0.1 M\[NaOH\]solution for complete neutralization. The percentage of nitrogen in the compound is       AIEEE  Solved  Paper-2010

    A) 29.5

    B)                        59.0                       

    C)        47.4       

    D)        23.7

    Correct Answer: D

    Solution :

    Equation of\[N{{H}_{3}}\] \[=(0.1\times 20)-(0.1\times 15)=0.5\] wt. of\[N{{H}_{3}}\] \[=0.5\times 17=8.5mg\] wt. of 'N' \[=\frac{14}{17}\times 8.5mg=7mg\] % of \['N'=\frac{7}{29.5}\times 100=23.7\]


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