Give an example of a chemical reaction which is followed by change in colour and state
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Answer:Starch and Iodine Solutions
The starch test is a chemical reaction that determines whether starch amylose is present in a substance. When you add starch to iodine in water, it creates a starch/iodine complex with an intense blue color. To test whether starch is present in a foodstuff, mix a solution of iodine and potassium iodide in water. The solution has a light orange-brown color, but when you apply it directly to a sample that contains starch (such as potatoes or bread), it turns a blue-black color.
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