Which of the following solution should be added to the food item to test for starch?

Copper sulphate solution

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Salt solution

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Lime water

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Iodine solution

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Solution

The correct option is D Iodine solution
Dilute iodine solution is used to test the presence of starch in a food item. When iodine is added to a solution or directly on to a food item such as potato, bread, rice, etc., the food item turns blue-black, indicating the presence of starch.

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Q. Anurag wanted to test for the presence of starch in different food items. He had four different chemicals. Which of the following should he use for his test?
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Given below are the steps to test the presence of proteins in a food item.

(i) Take a small quantity of the food item in a test tube, add 10 drops of water to it and shake it.

(ii) Make a paste or powder of food to be tested.

(iii) Add 10 drops of caustic soda solution to the test tube and shake well.

(iv) Add 2 drops of copper sulphate solution to it.

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(d) iv, ii, i, iii

Q. Vinay wants to test a food item for the presence of starch in it. Which among the following should he choose?

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Which of the following solution should be added to the food item to test for starch?

The correct option is D Iodine solutionDilute iodine solution is used to test the presence of starch in a food item. When iodine is added to a solution or directly on to a food item such as potato, bread, rice, etc., the food item turns blue-black, indicating the presence of starch.

The correct option is D Iodine solution
Dilute iodine solution is used to test the presence of starch in a food item. When iodine is added to a solution or directly on to a food item such as potato, bread, rice, etc., the food item turns blue-black, indicating the presence of starch.