BIOLOGY
MECHANISM OF ENZYME ACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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brown to blue-black
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blue-black to brown
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remains brown
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remians blue-black
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Detailed explanation-1: -Using an iodine solution, you can test for the presence of starch. When starch is present, the iodine changes from brown to blue-black or purple.
Detailed explanation-2: -Amylose in starch is responsible for the formation of a deep blue color in the presence of iodine. The iodine molecule slips inside of the amylose coil.
Detailed explanation-3: -On adding the iodine solution to starch, the two react to produce a blue-black color.
Detailed explanation-4: -Iodine is a common indicator to test for the presence of starch. The light orange-brown colour Iodine solution turns blue-black in colour when it reacts with starch. This indicates the presence of carbohydrates in the food item to which iodine solution was added.
Detailed explanation-5: -Iodine-KI Reagent: Iodine does not completely soluble in liquids, so the iodine reagent is formulated in the presence of potassium iodide by breaking down iodine in liquids. This creates the complex of a linear triiodide ion soluble, which slides into the starch coil, creating a vivid blue-black appearance.