A purple colour was obtained when sodium hydroxide solution and a drop of copper sulphate solution were added to a food substance. The food substance is likely to be a? by Sunday | Nov 24 | Biology WAEC | 0 comments A. carbohydrate B. fat C. protein D. sugar Correct Answer: Option C C. protein Users Also Read These:In the reaction between sodium hydroxide and…Assuming that brown colour is dominant over black…In a Biuret test, some protein was mixed with sodium…A drop of petrol makes a finger colder than a drop…When sodium hydroxide solution is added to a…