Make a paste or powder of food to be tested.
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(i) Make a paste or powder of food to be tested.
(ii) Take a small quantity of the food item in a test tube, add 10 drops of water to it and shake it.
(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.
Explanation:
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