Exams › NEET › Chemistry

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. 37.33
2. 45.33
3. 35.33
4. 43.33

Correct answer: 35.33

Solution

In Kjeldahl's method, the moles of H2SO4 neutralized are 0.01 mol (10 mL × 1 M). Since 1 mol of H2SO4 reacts with 2 mol of NH3, the moles of NH3 are 0.02 mol. The mass of nitrogen is 0.02 × 14 = 0.28 g. The percentage of nitrogen is (0.28/0.75) × 100 = 35.33%.

Related NEET Chemistry questions

• Which of the following statements is/are correct? This question has multiple correct options
• Calculate the \( \% \) composition of Carbon in \( C O_{2} . \) Molar mass is 44.01
• Which of the following rules regarding the significant figures and calculations involving them is not correct?
• \( 16.8 \mathrm{g} \) of metal carbonate on thermal decomposition gave 8 g of metallic oxide and \( 8.8 \mathrm{g} \) of carbon dioxide. They follow:
• Calculate the percent composition of carbon in \( C_{6} H_{12} O_{6} \)
• Which one of the followings has maximum number of atoms?

⚔️ Practice NEET Chemistry free + battle 1v1 →