Understanding Fehling's Test for Sugars

What is the primary purpose of Fehling's test?

• To detect the presence of proteins

• To identify reducing sugars

• To measure pH levels

• To test for the presence of lipids

Which of the following is a reducing sugar?

• Fructose

• Sucrose

• Starch

• Lactose

What is the role of sodium hydroxide in Fehling's reagent?

• To act as a catalyst

• To stabilize the solution

• To provide alkaline conditions

• To act as a reducing agent

What is the role of sodium potassium tartrate in Fehling's reagent?

• To act as a reducing agent

• To provide alkaline conditions

• To act as a catalyst

• To chelate copper ions

Which of the following is NOT a component of Fehling's reagent?

• Sodium potassium tartrate

• Sodium chloride

• Sodium hydroxide

• Copper sulfate

What color change indicates a positive Fehling's test?

• Yellow to orange

• Blue to reddish-brown

• Colorless to pink

• Blue to green

How can non-reducing sugars be tested using Fehling's test?

• By adding more Fehling's reagent

• By diluting the sample

• By heating the solution

• By hydrolyzing them with dilute acid

Who developed Fehling's reagent?

• Robert Koch

• Hermann von Fehling

• Louis Pasteur

• Stanley Rossiter Benedict

What is the main difference between Fehling's and Benedict's tests?

• Fehling's test is more stable

• Benedict's test is used for lipids

• Benedict's test is more stable and convenient

• Fehling's test is used for proteins

What is glycosuria?

• Presence of glucose in blood

• Presence of glucose in urine

• Absence of glucose in blood

• Absence of glucose in urine