Which of the following solutions help in identifying the presence of starch (carbohydrates) in a food item?

Correct option is A

The Correct Answer is Diluted Iodine solution. The presence of starch (a type of carbohydrate) in a food item can be detected using a diluted iodine solution. When iodine solution is added to a starch-containing substance, it reacts with starch and produces a blue black color, indicating its presence.
Information Booster:
· Iodine solution contains iodine (I₂) and potassium iodide (KI) dissolved in water.
· When this solution is added to a starch-containing substance, iodine molecules fit into the starch's helical structure, causing a blue-black coloration.
· If no starch is present, the solution remains brown or yellow.
· Uses of the Iodine Test:
· It is commonly used in laboratories, schools, and food industries to check for starch in food samples like potatoes, rice, wheat, and bread.
· It helps in quality control and nutritional analysis of food products.
Additional Knowledge:
· Copper sulphate solution → copper sulfate is used in the Biuret test, which detects proteins, not starch.
· Solution of caustic soda → caustic soda (sodium hydroxide) is used for protein and fat detection, not for carbohydrates.
· Diluted solution of potassium permanganate → potassium permanganate is used as an oxidizing agent and is not involved in starch detection.