Question

write test for protein, carbohydrates and fats.​

Answer 1

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Biuret test – Given sample food + Aqueous copper sulfate → Violet colouration confirms the presence of Proteins. Xanthoproteic test – Given sample food + Nitric acid → Yellow colour solution confirms the presence of proteins.

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Answer 2

Explanation:

#write test for protein

1. The presence of protein is tested by the Biuret test for proteins.
2. The Biurette reagent made of sodium hydroxide and copper (II) sulphate helps in determining the presence of protein in a sample.

#write test for carbohydrates

1. Molisch's test is a general test for carbohydrates. This test is given by almost all of the carbohydrates.
2. In this test, concentrated sulfuric acid converts the given carbohydrate into furfural or its derivatives, which react with α-naphthol to form a purple coloured product.

#write test for fats

1. Test for Fats
2. Take a small quantity of the food item to be tested.
3. Wrap the food item in a piece of paper and crush it.Straighten the paper.
4. Dry the paper by keeping it in sunlight for a while.
5. Observe the paper.
6. An oily patch on the paper indicates the presence of fats in the tested food item.