Which of the following foods turns blue-black with iodine solution?

Milk

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Groundnut

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Tomato

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Raw potato

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Solution

The correct option is D Raw potato
Starch (carbohydrate) is the mainly present in potato. Iodine solution is used to test the presence of starch in food materials. When iodine solution is added to a food item, it turns into blue-black colour if starch is present. If starch is not present, then the colour will stay orange or yellow. Thus, the correct answer is option D.

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