Food Test

Which test is commonly used to detect the presence of proteins in food?

• Iodine Test
• Biuret Test
• Benedict's Test
• Sudan III Test

What color change would you expect if starch is present in a food sample when using the iodine test?

• Red
• Blue-black
• Yellow
• Purple

Which of the following is used to test for the presence of fats or oils in food?

• Benedict’s solution
• Biuret solution
• Grease spot test
• Fehling’s solution

In the Benedict's test for reducing sugars, what color indicates a high concentration of reducing sugars?

• Blue
• Green
• Yellow
• Brick-red

Which test can be used to detect the presence of Vitamin C in a food sample?

• DCPIP Test
• Biuret Test
• Iodine Test
• Sudan III Test

What is the primary purpose of paper chromatography?

• To separate mixtures into their individual components
• To measure the pH of a solution
• To test for the presence of starch
• To determine the melting point of a substance

In paper chromatography, what is the role of the solvent?

• To react with the samples
• To carry the samples up the paper
• To dissolve the paper
• To measure the temperature

What does the Rf value in chromatography represent?

• The ratio of the solvent's weight to the sample's weight
• The distance the solvent front traveled
• The ratio of the distance traveled by the substance to the distance traveled by the solvent
• The color of the sample on the paper

Which of the following is NOT a factor that affects the separation of components in paper chromatography?

• Type of solvent used
• Temperature of the room
• Size of the paper
• Nature of the substance being separated

If a pigment in paper chromatography does not move from the baseline, what does this indicate?

• The pigment is highly soluble in the solvent
• The pigment is not soluble in the solvent
• The pigment is heavier than the solvent
• The paper is not properly prepared