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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What are the two methods to estimate nitrogen in organic compounds?
💡 Hint: Think about the names of the chemical processes discussed.
Question 2
Easy
Why is nitrogen important for plants?
💡 Hint: Consider the role of nitrogen in biological systems.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What method involves heating organic nitrogen compounds with copper oxide?
- Kjeldahl Method
- Dumas Method
- Gravimetric Method
💡 Hint: Think about the name of the method associated with heating.
Question 2
True or false: The Kjeldahl method directly measures nitrogen gas.
- True
- False
💡 Hint: Consider how each method interacts with ammonia.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A research chemist uses the Dumas method for nitrogen estimation on a 1g sample that produces 0.5L of nitrogen gas at STP. Calculate the mass percentage of nitrogen in the original sample.
💡 Hint: Use the relation that 1 mole of gas occupies 22.4L at STP.
Question 2
In the Kjeldahl method, a 0.2 g sample yields 15 mL of ammonia when treated with sulfuric acid. How would you calculate the percentage of nitrogen from the given data?
💡 Hint: Remember the stoichiometry of ammonia to nitrogen conversion.
Challenge and get performance evaluation