Presence of starch is tested by using

Iodine

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Ammonium chloride

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Hydrochloric acid

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Agar agar solution

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Solution

The correct option is A Iodine
Iodine test is used to determine the presence of starch in food items. If iodine is added to any food item and it causes the food item to turn to blue-black colour, it indicates the presence of the nutrient called starch (carbohydrate).
So, the answer is A.

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Iodine is used to test the presence of starch.

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