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Question
Iodine gives blue-black colour with
Iodine gives blue-black colour with
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Solution
The correct option is D Starch
- The iodine test is used for the determination of the presence of starch in a sample.
- Molecular iodine is not soluble in water and hence potassium iodide is added to it.
- Together they form a polyiodide complex which upon addition of starch turns intense blue-black colour.
- Starch is a polymer of amylose and amylopectin, of which amylose is responsible for the blue colour of the reaction.
- In the absence of starch solution remain as light brown colour which is the colour of iodine solution.
- The iodine test is used for the determination of the presence of starch in a sample.
- Molecular iodine is not soluble in water and hence potassium iodide is added to it.
- Together they form a polyiodide complex which upon addition of starch turns intense blue-black colour.
- Starch is a polymer of amylose and amylopectin, of which amylose is responsible for the blue colour of the reaction.
- In the absence of starch solution remain as light brown colour which is the colour of iodine solution.
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