Question

Some food samples eg milk, rice and oil are taken for testing after testing violet/purple colour appears in one of the test tube. i) To which food group the food sample belongs giving violet colour with the chemicals? ii) Name the chemicals that can be used to test the specific nutrient. iii) Write 2 more examples of food samples which can also give the positive results with the same chemicals.​

Answer 1

1) The change in colour of the food item to violet after the mixing of the food samples indicates the presence of proteins in the food item.

2) chemical that can be used to test the specific nutrient add two drops of copper sulphate solution and a few drops of caustic soda solution

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