The egg whites give purple/ violet colour on adding the solution of copper sulphate and caustic soda. This indicates the presence of _____ in it.

carbohydrates

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proteins

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vitamins

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fats

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Solution

The correct option is B proteins
$∙$ Egg whites are rich in protein.
$∙$ If a food turns purple or violet upon adding the solution of copper sulphate and caustic soda, then it is likely to contain protein.
$∙$ The solution of copper sulphate and caustic soda, which is known as biuret solution, is blue in colour. It turns violet or purple upon reacting with proteins.

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