On treatment with iodine, the presence of starch is confirmed by the appearance of:

Blue-black colour

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Blue colour

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Red colour

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Solution

The correct option is A
Blue-black colour

Iodine solution acts as an indicator to check the presence of carbohydrates or starch. Starch is a complex carbohydrate formed by the combination of many molecules of simple sugars (glucose). Blue-black colour appears when starch containing food is treated with iodine solution.

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