When starch is treated with iodine solution, its colour changes to

Yellow

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Red

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Blue-black

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Green

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Solution

The correct option is C Blue-black
Starch is the storage food reserve of a plant which is mainly present in the leaf. When its presence is tested by Iodine, It forms a blue- black color complex of starch Iodide. The iodine/starch complex has energy level spacings that are just so for absorbing visible light giving the complex its intense blue color.
So, the correct answer is option C.

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