To show presence of protein in foodstuffs, what are the reagents that are used?

Options :
  1. Hydrochloric acid and ammonium hydroxide solution
  2. Nitric acid and copper sulphate solution
  3. Potassium hydroxide and copper sulphate solution
  4. Nitric acid and ammonium hydroxide solution
Answer and Explanation :-

Answer: Option 3

Explanation:

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