Ben was doing an experiment and added a solution to food containing starch and saw a blue-black colouration. What solution do you think he added?

Lime water

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Iodine solution

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Salt solution

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Copper sulphate solution

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Solution

The correct option is B Iodine solution
Dilute iodine solution is used to test the presence of starch in a food item. When iodine is added to a solution or directly on to a food item such as potato, bread, rice, etc., the food item turns blue-black, indicating the presence of starch.

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