NEET Sample Paper NEET Sample Test Paper-25

  • question_answer In Dumas' method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be: (Aqueous tension at 300 K =15 mm)

    A)  14.45

    B)  15.45

    C)  16.45

    D)  17.45

    Correct Answer: C

    Solution :

     \[{{P}_{{{N}_{2}}}}=715-15=700\,mm\] \[V=55\,mL\] \[\therefore \]      \[PV=\frac{w}{M}RT\] \[\frac{700}{760}\times \frac{55}{1000}=\frac{{{w}_{{{N}_{2}}}}}{28}\times 0.0821\times 300\] \[{{w}_{{{N}_{2}}}}=0.058\,g\] \[\therefore \]% \[{{N}_{2}}=\frac{0.058}{0.35}\times 100=16.45\]s

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