Iodine test is shown by

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(B) The iodine test is a chemical test used to detect the presence of starch. Starch is a polysaccharide that forms a helical structure,which can trap

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Starch

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(B) The iodine test is a chemical test used to detect the presence of starch. Starch is a polysaccharide that forms a helical structure,which can trap iodine molecules $(I_2)$ within its coils to form a starch-iodine complex. This complex produces a characteristic deep blue color. When the solution is heated,the helical structure of starch unwinds,releasing the iodine molecules,and the blue color disappears. Upon cooling,the starch molecules re-form their helical structure,trapping the iodine again,and the blue color reappears. Therefore,starch gives a positive iodine test.

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