Question

Does raw potato becomes purple colour when 2 drops of copper sulphate solution and 10 drops of caustic soda is added to it?

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Answer 1

Answer:

Add 2 drops of copper sulphate solution and 10 drops of caustic soda and shake the test tube. You will see a violet colour. This indicates the presence of proteins in dal.

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Answer 2

The answer is raw potato becomes a blue-black color when iodine solution is added.

Explanation:

Test for protein:

• Two drops of copper sulphate and ten drops of caustic soda turn purple when added to the egg and not raw potato.
• This suggests that proteins are present.
• This is the Biuret test, and the basic idea is as follows:
• When an alkaline solution (such as caustic soda or NaOH) is present, the Cu2 + ions are converted to Cu + and bond to the proteins in the egg, giving it a violet hue.

Test for starch:

• Adding dd 2-3 drops of iodine solution gives a blue-black color to raw potato indicating the presence of starch.
• The food's starch reacts with the iodine that was added to it.
• This results in a blue-black Starch-Iodine combination.
• Thus, the occurrence of a color change to a blue-black color verifies that the food item contains starch.

Therefore egg whites become purple in colour when 2 drops of copper sulphate solution and 10 drops of caustic soda is added to it.

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