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Svetllana [295]
3 years ago
6

What is iodine solution changing from amber-yellow to blue-black an indication of?

Biology
2 answers:
erma4kov [3.2K]3 years ago
6 0
The answer is D. Iodine is used to test for starches and, in the presence of a starch, it will turn a dark blue-black color.
Vitek1552 [10]3 years ago
6 0

Iodine solution is prepared by dissolving iodine in a solution of potassium iodide. This iodine reagent is amber-yellow colored. When this iodine solution is added to starch solution which is a polysaccharide, the yellow colored reagent changes to blue-block color. This color change is due to the formation of a charge transfer complex between starch and the triioidide present in iodine solution. So, the correct answer is d. the presence of starches or complex carbohydrates

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