Qualitative Analysis of Organic Compounds
Chemistry ⇒ Carbon and Organic Chemistry
Qualitative Analysis of Organic Compounds starts at 11 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Qualitative Analysis of Organic Compounds.
How you perform is determined by your score and the time you take.
When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 12
A student adds AgNO3 to the acidified Lassaigne’s extract and observes a pale yellow precipitate. Which halogen is present?
A student fuses an organic compound with sodium, extracts the mass with water, and adds FeSO4. After acidification, no blue or green color is observed. What does this indicate?
A student performs the Lassaigne’s test and observes a greenish-blue color after adding FeSO4 and acidifying. What does this indicate?
Describe the chemical reaction that occurs when sodium fusion extract containing nitrogen is treated with FeSO4 and then acidified with H2SO4.
Describe the interference caused by the simultaneous presence of nitrogen and sulphur in the Lassaigne’s test for halogens.
Describe the procedure for detecting halogens in an organic compound using the Lassaigne’s test.
Describe the test for the detection of phosphorus in an organic compound.
Explain the reason for using freshly cut sodium in the Lassaigne’s test.
Explain why it is necessary to acidify the Lassaigne’s extract with nitric acid before testing for halogens with silver nitrate.
Explain why organic compounds are fused with sodium in the Lassaigne’s test rather than potassium.
Explain why sodium is used in the Lassaigne’s test.
Explain why the Lassaigne’s test is not suitable for detecting oxygen in organic compounds.
Explain why the Lassaigne’s test is performed before quantitative analysis of organic compounds.
The Lassaigne’s test is used to detect the presence of which elements in organic compounds?
