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Ashwin wants to check the presence of protein in his food. He put it for caustic soda and copper sulphate solution test. If the food contain protein, the color of solution will turn ________.
1. green
2. violet
3. red
4. yellow

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Correct Answer - Option 2 : violet

Copper Sulphate and caustic soda solution.

  • Copper Sulphate and caustic soda solution are used to test the presence of proteins.
  • The food in mashed form is taken for the test.
  • Two drops of copper sulphate and 10 drops of caustic soda is added to it.
  • If the mixture turns violet colour that indicates the presence of proteins in the food.

So, the correct option is violet.

Test For Starch:

  1. Take a small quantity of a food item or a raw ingredient. Put 2-3 drops of dilute iodine solution on it
  2. Observe if there is any change in the colour of the food item.
  3. A blue-black colour indicates that it contains starch.

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