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Question

29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in 20 ml of 0.1 M HCl solution. The excess of acid required 15 ml of 0.1 M NaOH solution for complete neutralisation. The percentage of nitrogen in the compound is:

A
29.5
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B
59
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C
23.7
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D
47.4
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Solution

The correct option is C 23.7
millimoles of HCl observed =20×0.1=2

millimoles of NaOH=15×0.1=1.5

Moles of HCl reacting with Ammonia=moles of HCl absorbedMoles of NaOH solution required=21.5=0.5

millimoles of NH3=0.5

Milligrams of N in NH3=0.5×14=7mg

% of N=729.5×100=23.7%

Hence the correct answer is option (C).

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