Observe the given experimental figures carefully, What does this experiment prove?

Options

A. Material X contains proteins.
B. Material X contains carbohydrates.
C. Material X contains fats.
D. Material X contains iodine.

Answer

A

Explanation

Presence of protein in any sample can be tested by adding copper sulphate solution and caustic soda to the test tube containing the sample solution. On shaking, the solution changes its colour to violet. This indicates the presence of proteins in that sample. Hence, material X that shows violet colour confirms that it contains proteins.