Food test

Question 1

What reagent is used to test for starch, and what is the color change?

Answer 1

Reagent: Iodine solution
Color change: Brown → Blue-black (if starch is present)

Question 2

What reagent is used to test for glucose (reducing sugars), and what is the color change?

Answer 2

Reagent: Benedict’s solution
Color change (with heat): Blue → Green → Yellow → Orange → Brick red (depending on sugar concentration)

Question 3

What reagent is used to test for proteins, and what is the color change?

Answer 3

Reagent: Biuret solution
Color change: Blue → Purple/Lilac (if protein is present)

Question 4

What reagent is used to test for lipids, and what is the color change?

Answer 4

Reagent: Ethanol (Emulsion Test)
Color change: Clear → Milky-white emulsion (if lipids are present)