Q70 / 180 · NEET 2014 · Chemistry

In the Kjedahl's method for estimation of nitrogen present in soil sample, ammonia evolved from $0.75 g$ of sample neutralized $10 m l$ of $1 M H_{2} {S O}_{4}$ The percentage of nitrogen in the soil is:

Correct answer
A
$37.83$
B
$45.3 2$
C
$35.33$
D
$45.33$

Solution

moles of

1 M H_{2} S O_{4} = 10 m m o l

moles of

N H_{3}

consumed

= 20 m m o l

Weight of

N = \frac{14 \times 20}{1000} g = 0.280 g

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

Hence, the correct answer is option: 'A'.

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