If iodine is dropped on the boiled leaf it gives blue-black colour due to the presence of
(a) starch
(b) protein
(c) fat
(d) vitamin
Answers
due to the presence of strach
If iodine is dropped on the boiled leaf it gives blue-black colour due to the presence of starch.
Explanation:
Starch is a hydrocarbon found in plants. It consists of two different forms of polysaccharides composed of units of glucose that are related in two different ways. Another is linear amylose and the other is amylopectin. Amylose, the branched compound responsible for blue hue. The chain forms a helix shape, and inside this helix, iodine can be bound.
Iodine is not very water soluble so the iodine reagent is formed by dissolving iodine in water in the presence of potassium iodide. This makes a linear triiodide ion complex with solubility that slips into the starch's coil resulting in an extreme blue-black hue.
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