NEET Chemistry NEET PYQ-Organic Chemistry Some Basic Principles

  • question_answer
         In the Kjeldahl’s method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralised 10mL of 1 M \[{{H}_{2}}S{{O}_{4}}\]. The percentage of nitrogen in the soil is       [AIPMT 2014]

    A) 37.33

    B) 45.33

    C) 35.33

    D) 43.33

    Correct Answer: A

    Solution :

    [a] In Kjeldahl’s method, percentage of N is given by \[%N=\frac{\text{1}\text{.4 }\!\!\times\!\!\text{ Normality}\,\text{of}\,\text{acid }\!\!\times\!\!\text{ volume}\,\text{ofacid}}{\text{Weight}\,\text{of}\,\text{compound}}\] \[1M{{H}_{2}}S{{O}_{4}}=2N{{H}_{2}}S{{O}_{4}}\] \[\therefore \]      \[%N=\frac{1.4\times 2\times 1}{0.75}=37.33%\]

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