NUTRITION
CARBOHYDRATES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The color of the positive result for Iodine test
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Blue - violet
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Yellow - orange
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Pink
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Green
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Explanation:
Detailed explanation-1: -The appearance of blue-black color indicates the presence of the starch in the sample, i.e., a positive iodine test (Figure 3).
Detailed explanation-2: -Pure iodine is violet, but when it’s dissolved in water, it accepts an electron from the oxygen atom, affecting how it absorbs light. When you shake the fluids, the iodine leaves the water and dissolves in the oil, and returns to its purple colour!
Detailed explanation-3: -Result and Interpretation of Iodine Test A positive test is when a purple or blue-black color appears. This indicates the presence of starch. If the color does not change, it is negative. This indicates that there is no starch.
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