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Question

Iodine test can detect

A
Carbohydrates
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B
Nucleic acids
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C
Lipids
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D
Proteins
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Solution

The correct option is B Carbohydrates
Starch is used as food reserves in plants. It is a polymer of glucose. It is formed by the attachment of glucose unit by glycosidic bonds. The basic formula of starch is (C6H10O5)n.
The presence of starch can be detected by starch iodide test. On adding Iodine to the food having starch, it turns blue which indicates the presence of starch. The complex is known as starch iodide complex.

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