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 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.
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?
Which color precipitate indicates the presence of chlorine when the Lassaigne’s extract is treated with AgNO3? (1) White (2) Yellow (3) Black (4) Green
Which of the following elements is NOT commonly detected during the qualitative analysis of organic compounds? (1) Nitrogen (2) Sulphur (3) Phosphorus (4) Calcium
Which of the following halides gives a yellow precipitate with AgNO3 in the Lassaigne’s test? (1) Chloride (2) Bromide (3) Iodide (4) Fluoride
Which of the following ions is formed when nitrogen is present in the organic compound during the Lassaigne’s test? (1) NaCN (2) Na2SO4 (3) NaCl (4) NaNO3
Fill in the blank: The black precipitate formed when lead acetate is added to the Lassaigne’s extract indicates the presence of ______.
Fill in the blank: The formation of a blue or green color with ferrous sulphate and ferric chloride in the Lassaigne’s extract indicates the presence of ______.
Fill in the blank: The formation of a yellow precipitate with ammonium molybdate in the presence of nitric acid indicates the presence of ______ in the organic compound.
Fill in the blank: The Prussian blue color in the Lassaigne’s test is due to the formation of ______.
State whether the following statement is true or false: The Lassaigne’s test can be used to detect both organic and inorganic compounds.
State whether the following statement is true or false: The sodium fusion test is also known as the Lassaigne’s test.
True or False: The Lassaigne’s test can be used to detect both primary and secondary amines for nitrogen.
True or False: The Lassaigne’s test can be used to detect fluorine in organic compounds.
