18 Questions
What does the blue precipitate in the lower layer indicate in the identification of fatty acids?
Saturated fatty acids
Which test is used to identify cotton seed oil?
Halphen test
What is the result of the Liebermann test for cholesterol?
The solution becomes red then rapidly changes to deep blue
What is the characteristic of cholesterol crystals under a microscope?
Appearance of a broken glass
What is the significance of the presence of cholesterol in vegetable oils?
It indicates adulteration with fat of animal origin
What is the result of the Baudouin's test for semisame oil?
A pink color is formed in the acid layer
What is the result of the Borax test when glycerol is added to the solution?
A pink color reappears
What is the purpose of the Grease stain test in the identification of fatty acids?
To distinguish between saturated and unsaturated fatty acids
In which of the following solvents is glycerol insoluble?
Ether and chloroform
What is the result of the Iodine test when a saturated fatty acid is added to the solution?
The pink color of iodine appears
What is the purpose of the Copper acetate test in the identification of fatty acids?
To identify the type of fatty acid present in a sample
What is the result of the Achroline test when glycerol is added to the solution?
Acroline compound is formed
What is the characteristic of glycerol that makes it useful in vanishing cream?
It is very hygroscopic
What is the main difference between oils and fats?
Oils are liquid at room temperature, while fats are solid
What type of lipids are esters of fatty acids with glycerol or other alcohols?
Simple lipids
What is the typical carbon atom chain length of fatty acids?
3-17 carbon atoms
What is the process by which fats are broken down into glycerol and fatty acids?
Hydrolysis
What is the characteristic of glycerol in terms of its solubility?
It is soluble in water and alcohol, but insoluble in ether
This quiz covers the identification and testing of fatty acids, including saturated and unsaturated fatty acids, and specific tests for cotton seed oil and sesame oil.
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