Question

Paheli took a paste of food sample in a test tube and after that she added few drops of copper sulphate solution followed by caustic soda solution. It was observed that the solution turned violet after few minutes. Which nutrient / nutrients can she identify using these chemicals? (i) Proteins (ii) Vitamins (iii) Fats (iv) Carbohydrates Choose the correct option: * Both (i) and (ii) (iv) only (i) only Both (ii) and (iv)​

Answer 1

Answer:

Following steps are used to test if a food item contains protein.

1) Take a small quantity of the food items to be tested.

2) Grind/mash the food item.

3) Put the food item into a test tube.

4) Add 10 drops of water and shake the test tube.

5) Add two drops of copper sulphate solution to the test tube, using a dropper.

6) Add 10 drops of caustic soda solution using a dropper and shake the test tube.

7) Let the test tube rest in a test tube stand for a few minutes.

8) Observe the colour of the mixture.

9) Violet colour indicates the presence of proteins in the tested food item.

Explanation:

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Answer 2

Answer:

carbohydrates

only both