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NEET 2014
Exam
NEET
Year
2014
Subject
Chemistry
Chapter
General Organic Chemistry

NEET 2014 · Chemistry · General Organic Chemistry

In the Kjedahl's method for estimation of nitrogen present in soil...

In the Kjedahl's method for estimation of nitrogen present in soil sample, ammonia evolved from 0.75g0.75g of sample neutralized 10ml10ml of 1MH2SO41M{H}_{2}{SO}_{4} The percentage of nitrogen in the soil is:

Options

  1. A37.8337.83
  2. B45.3245.32
  3. C35.3335.33
  4. D45.3345.33

Correct answer

A. 37.8337.83

Step-by-step solution

moles of 1MH2SO4=10mmol1M{H}_{2}S{O}_{4} = 10mmol

moles of NH3N{H}_{3} consumed =20mmol= 20mmol

Weight of N=14×201000g=0.280gN = \dfrac{14 \times 20}{1000}g = 0.280g

% N = \dfrac{0 .280}{0 .75} \times 100 = 37 .33 %
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