Write test detecting the presence of starch.

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Solution

Take a piece of the food item. Put 2-3 drops of dilute iodine solution on it. If the colour of the food item becomes blue-black, then it indicates the presence of starch in the food item.
(i) Food + Iodine - Blue-black colour (starch present)
(ii) Food + Iodine - No blue-black colour (no starch present)

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