When food rich in starch is treated with iodine, it turns into _____.

blue-black colour

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orange colour

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red colour

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pink colour

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Solution

The correct option is A
blue-black colour

Using iodine to test for the presence of starch is a common experiment. Solution of iodine (I₂) and potassium iodide (KI) in water has a light orange-brown colour. If it is added to a sample that contains starch, such as the bread pictured, the colour changes to a deep blue.

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Study the given statements and select the correct answer.
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