When a few drops of iodine solution is added to rice water, the solution turns blue-black in colour. This indicates that rice water contains

Correct answer: starch

Explanation: ✅ Correct Answer: C) starch 📚 Explanation: The chemical reaction between iodine and starch results in a deep blue-black color, which is the standard laboratory test for identifying this carbohydrate. Since rice water contains a high amount of starch, it shows this clear change. Iodine molecules get trapped inside the coiled structure of the starch molecule to produce the color. This test is a common science experiment used to analyze food components.