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  4. In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 1 g of sample neutralized 10 mL of text1M H2 textS textO4. The percentage of nitrogen in the soil is [Report your answer to the nearest integer]

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Q. In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 1 g of sample neutralized 10 mL of $\text{1M H}_{2}\text{S}\text{O}_{4}.$ The percentage of nitrogen in the soil is
[Report your answer to the nearest integer]

NTA AbhyasNTA Abhyas 2022

Solution:

In 1 g of sample the percentage of nitrogen can be find out as follows
$N\%=\frac{14 \times N \times V}{W_{O . C .}}\times 100$
Here $N\times V$ of $H_{2}SO_{4}=n\times M\times V$
$=2\times 1\times 10\times 10^{- 3}=20\times 10^{- 3}$
% Nitrogen $=\frac{14 \times 20 \times 1 0^{- 3}}{1}\times 100=28\%$