Food Testing Quiz

What is the purpose of using iodine in food testing?

• To test for protein

• To test for fat

• To test for starch

• To test for sugar

What color does iodine change to if starch is present in the food sample?

• Orange

• Blue/black

• Red/brown

• Green

Which solution is used to test for the presence of reducing sugars in food?

• Biuret’s solution

• Benedict’s solution + heat

• Iodine

• Hydrochloric acid

What is the initial color of Benedict’s solution before testing for reducing sugars?

• Blue

• Red

• Yellow

• Green

What color indicates a positive result for reducing sugars when using Benedict’s solution?

• Blue

• Red

• Orange

• Purple

What solution is used to test for the presence of starch in a sample?

• Benedict's solution

• Biuret's solution

• Iodine solution

• Ethanol and water

What color change indicates the presence of sugar when using Benedict's solution?

• Red to brown

• Blue to black

• Blue to orange

• Colorless to cloudy

When testing for fat using ethanol and water, what is the observed color change if fat is present?

• Blue to purple

• Colorless to cloudy

• Red to brown

• Blue to black

Which solution is used to test for proteins in a sample?

• Iodine solution

• Benedict's solution

• Ethanol and water

• Biuret's solution

What color does Biuret's solution turn if protein is present in the sample?

• Blue to purple

• Colorless to cloudy

• Blue to orange

• Red to brown