The presence of _________ is detected by addition of copper sulphate and caustic soda solutions?
A
Protein
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B
Fat
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C
Vitamin
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D
Carbohydrate
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Solution
The correct option is A
Protein
This is called the 'Biuret Test' and is a method to check for the presence of protiens in food. In protein is present, the colour of the food changes to violet.