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For the estimation of nitrogen, 2.8g of an organic compound was digested by kjeldahl method and the evolved ammonia was absorbed in 80 ml of 0.2M sulphuric acid. The unreacted acid required 40 ml of 0.4M sodium hydroxide for complete neutralization. The percentage of the nitrogen in the compound is:

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$16 %$

$1.6 %$

answer is A.

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Detailed Solution

Basicity of sulphuric acid is 2

Milli eq of sulphuric acid taken $= 80 \times \frac{1}{5} \times 2 = 32$

Milli eq of sulphuric acid used by $N a O H = 40 \times \frac{2}{5} = 16$

Milli eq reacted with $N H_{3} =$ 32-16=16

% of N in the compound $= 0.14 \times \frac{16}{2.8} = 8 %$

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