WorksheetsQualitative Test for Carbohydrates
Total questions: 15
Worksheet time: 8mins
What is the general formula for carbohydrates?
Cn(H2O)n
Cn(H2O)n+1
Cn(H2O)n-1
Cn(H2O)n/2
Which category of carbohydrates cannot be further hydrolyzed to simpler units?
Monosaccharides
Disaccharides
Polysaccharides
All of the above
Which monosaccharide is abundant in germinating barley?
Glucose
Fructose
Maltose
Sucrose
Which disaccharide is also known as cane sugar or beet sugar?
Maltose
Glucose
Fructose
Sucrose
Which polysaccharide functions as a structural unit?
Cellulose
Starch
Dextrin
Glycogen
Which chemical test is used to detect the presence of carbohydrates based on the formation of furfural and its derivatives?
Molisch Test
Bial's Orcinol Test
Seliwanoff's Test
Tollen's Test
What is the purpose of the Molisch test?
To detect the presence of pentoses
To differentiate ketohexoses from aldohexoses
To determine the reducing property of sugars
To detect the presence of carbohydrates
Which test is used to differentiate ketohexoses from aldohexoses?
Molisch Test
Bial's Orcinol Test
Seliwanoff's Test
Phenylhydrazine Test
Which test is a very sensitive test done under mildly alkaline conditions?
Benedict's Test
Barfoed's Test
Phenylhydrazine Test
Tollen's Test
What is the purpose of Barfoed's test?
To detect the presence of pentoses
To differentiate ketohexoses from aldohexoses
To determine the reducing property of sugars
To distinguish monosaccharides, disaccharides, and oligosaccharides
What is formed when sugar is added to phenylhydrazine and sodium acetate and then heated?
A brick-red precipitate
A yellow precipitate
A purple ring
A silver mirror
Which test is capable of reducing Tollen's reagent to form a gray to black precipitate?
Benedict's Test
Barfoed's Test
Phenylhydrazine Test
Tollen's Test
What is the color of the precipitate formed in Tollen's test?
Brick-red
Yellow
Purple
Gray to black
What is the purpose of the Phenylhydrazine test?
To detect the presence of pentoses
To differentiate ketohexoses from aldohexoses
To determine the reducing property of sugars
To form a gray to black precipitate
Which sugar forms the same osazones as glucose and mannose?
Glucose
Maltose
Fructose
Lactose
