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Question

In the Kjedahl's method for estimation of nitrogen present in soil sample, ammonia evolved from 0.75g of sample neutralized 10ml. of 1MH2SO4. The percentage of nitrogen in the soil is:

A
37.33
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B
445.33
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C
35.33
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D
43.33
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Solution

The correct option is A 37.33
10 ml of 1MH2SO4 corresponds to 10 mmol.

It will neutralize 20 mmol of NH3.

Weight of N=14×201000g=0.280g.

Thus 0.75 g of sample of organic compound contains 0.280 g of nitrogen.

The percentage of nitrogen in the organic sample is 0.2800.75×100=37.33%.

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