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In the Kjeldahl’s method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75g of compound neutralized 10 ml of 1 M H₂SO₄. The percentage of nitrogen in the soil is:

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37.33

45.33

35.33

43.33

answer is A.

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Detailed Solution

$\begin{array}{l} % N = \frac{1 .4 NV}{W} \\ 10 mL 1 M H_{2} {SO}_{4} \equiv evolved {NH}_{3} \\ ∵ V = 10 mL \\ N = n factor \times M \\ = 2 \times 1 = 2 N \\ % N = \frac{1 .4 \times 2 \times 10}{0 .75} = 37 .33 % \end{array}$

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