WAEC - Chemistry (2000 - No. 35)
Two-organic substances are labelled K and L if K gave a blue-black colour with iodine solution and L gave a deep red precipitate with Million's reagent, it can be concluded that
K is a carbohydrate and L is a protein
K is alkaline and L is acidic
K is unsaturated and L is a reducing sugar
K is a reducing agent and L is an amino acid
Uitleg
Substance K can be said to be Carbohydrate because starch (carbohydrate) when reacted with iodine, gives a blue-black colour while Protein (substance L) reacts with a Million's reagent to give a deep-red ppt. Hence, the correct answer is A