Question

the substance that hives blue colour with iodine​

Answer 1

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Amylose

Amylose is the compound that is responsible for the blue color. Its chain forms a helix shape, and iodine can be bound inside this helix (pictured below).

Answer 2

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Amylose

Amylose is the compound that is responsible for the blue color. Its chain forms a helix shape, and iodine can be bound inside this helix (pictured below).