The presence of starch is identified by __________

Isotonic test

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Alcohol test

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Iodine test

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None of the choices

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Solution

The correct option is C
Iodine test

Iodine test

The iodine test is used to test for the presence of starch. Starch turns into intense "blue-black" colour when we add aqueous solutions of the triiodide anion.

Starch is is the most abundant biomolecule on earth after cellulose and the major carbohydrate reserve in plant tubers and seed endosperm.

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Iodine is used to test the presence of starch.

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