Few drops of dilute iodine solution is added to both the test tubes. Blue colour appears in the test tube B. What change occurs in test tube A? Why?
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Explanation: Iodine test is used to check the presence of starch. ... Therefore when iodine is added in both tube the color of tube B changes to dark blue which indicates the presence of starch while no reaction takes place in tube A which means there is no starch.
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