Qualitative Analysis of Organic Compounds
Chemistry ⇒ Carbon and Organic Chemistry
Qualitative Analysis of Organic Compounds starts at 11 and continues till grade 12.
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A student is given an organic compound and asked to detect the presence of nitrogen. Describe the steps they should follow using the Lassaigne’s test.
A student performs the Lassaigne’s test and observes a blood red color upon addition of FeCl₃ to the extract. What does this indicate?
Describe the chemical reaction that occurs when an organic compound containing nitrogen is fused with sodium in the Lassaigne’s test.
Describe the procedure for detecting halogens in an organic compound using Lassaigne’s extract.
Describe the role of FeSO₄ in the detection of nitrogen in the Lassaigne’s test.
A student adds AgNO₃ to the acidified Lassaigne’s extract and observes a yellow precipitate that is insoluble in ammonia. Which halogen is present? (1) Chlorine (2) Bromine (3) Iodine (4) Fluorine
A student is given an organic compound and asked to detect the presence of nitrogen. Describe the steps they should follow using the Lassaigne’s test.
A student performs the Lassaigne’s test and observes a blood red color upon addition of FeCl₃ to the extract. What does this indicate?
A student adds AgNO₃ to the acidified Lassaigne’s extract and observes a yellow precipitate that is insoluble in ammonia. Which halogen is present? (1) Chlorine (2) Bromine (3) Iodine (4) Fluorine
Which gas is evolved when an organic compound containing nitrogen is heated with soda lime? (1) Ammonia (2) Nitrogen dioxide (3) Hydrogen chloride (4) Sulphur dioxide
Which of the following elements is NOT commonly detected during the qualitative analysis of organic compounds? (1) Carbon (2) Hydrogen (3) Nitrogen (4) Calcium
Which of the following is a confirmatory test for the presence of sulphur in an organic compound? (1) Formation of a black precipitate with lead acetate (2) Formation of a blue color with FeSO₄ (3) Formation of a white precipitate with AgNO₃ (4) Evolution of ammonia gas
Fill in the blank: The black precipitate formed during the detection of sulphur in the Lassaigne’s extract is ______.
Fill in the blank: The formation of a white precipitate with AgNO₃ in the Lassaigne’s extract indicates the presence of ______.
Fill in the blank: The Lassaigne’s extract is prepared by fusing the organic compound with ______ and extracting the fused mass with water.
Fill in the blank: The presence of both nitrogen and sulphur in an organic compound is indicated by the formation of a ______ color with FeCl₃ in the Lassaigne’s extract.
True or False: The Lassaigne’s test can be used to detect fluorine in organic compounds.
True or False: The Lassaigne’s test can detect both chlorine and bromine in the same organic compound.
True or False: The Lassaigne’s test is a qualitative analysis technique used to detect the presence of certain elements in organic compounds.
True or False: The presence of both nitrogen and sulphur in an organic compound can interfere with the detection of halogens in the Lassaigne’s test.
