Sodium hydroxide and copper sulphate are used to test the presence of in the food.

fat

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protein

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carbohydrate

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Solution

The correct option is B protein
 Protein is one of the essential food components which helps in the growth and maintenance of the body. A mixture of 2% copper sulphate solution and 10% sodium hydroxide solution is used to test protein in the food sample. Formation of purple or violet colour confirms the presence of protein in the sample. This test is also called as "Biuret Test".

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Similar questions

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?
(a) iodine
(b) an acid
(c) copper sulphate
(d) potassium hydroxide

Copper sulphate reacts with sodium hydroxide to form a blue precipitate of copper hydroxide and sodium sulphate. In an experiment, 15.95 g of copper sulphate reacted with 8.0 g of sodium hydroxide to form 9.75 g of copper hydroxide and 14.2 g of sodium sulphate. Which law of chemical combination is illustrated by this data?

Q. How will you distinguish between Ammonium hydroxide and Sodium hydroxide using copper sulphate solution?

When copper sulphate and caustic soda are added to a food sample, a violet color indicates the presence of proteins in the food.

Q54) Consider the following statements

i) Iodine solution is used to test the presence of fat.

ii) Vitamins have no nutritive value, but provide protection against disease.

iii) Mixture of copper sulphate and caustic soda is used to test the presence of proteins.

Which of the above statements are true?

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