Which chemicals are used to test the presence of proteins in a given food sample?
i. Copper sulphate solution ii. Caustic soda iii. Acetic acid iv. Sodium chloride

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i and ii only

i, ii, iii, and iv

i and iv only

iii and iv only

answer is D.

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Detailed Solution

To test the presence of protein in a given food sample, we need to perform the following steps.

Take the food sample in the form of a paste or powder.
Take a test tube and pour a small amount of the food sample into it. Now add 10 drops of water and shake the test tube.
Add two drops of copper sulphate solution and ten drops of caustic soda solution to the test tube with the help of a dropper.
Allow the contents to settle for some time.
If the contents in the test tube turn violet in colour after some time, the presence of proteins can be inferred.

Thus, to test the presence of proteins in a given food sample, solutions of copper sulphate and caustic soda are used.

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