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Some Basic Concepts of Organic Chemistry question

2014 · Q113
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Some Basic Concepts of Organic Chemistry question

2014 · Q113

NEETChemistrySome Basic Concepts of Organic ChemistryMCQ+4 / −1
In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M H2SO4. The percentage of nitrogen in the soil is
  1. A
    37.33
  2. B
    45.33
  3. C
    35.33
  4. D
    43.33
View written solutionFree

Correct answer: A

10 ml, 1 M H2SO4 = 20 ml, 1 M NH3

∵\because∵ wt of N in one mole NH3 = 14

∴\therefore∴ 20 × 10–3 mol NH3 →\to→ 20 × 10–3 × 14 nitrogen

∴\therefore∴ 0.75 g of sample contains = 14×20×10−30.75×100{{14 \times 20 \times {{10}^{ - 3}}} \over {0.75}} \times 1000.7514×20×10−3​×100

= 37.33%

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