WAEC Biology 2015 Objective — Question 22
Question 22 of 50 from the West African Examinations Council (WAEC) Biology 2015 Objective paper, with the correct answer and a full explanation.
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A student used the following steps in testing for non-reducing sugar: (i) added Benedict's solution to the sugar solution (ii) added dilute hydrochloric acid to the sugar solution and boiled it (iii) added sodium hydroxide solution to the solution in II and boiled it (iv) added Benedict's solution to the cooled solution in III. Why did the student add dilute hydrochloric acid to the sugar solution in step II?
- A. to oxidize the sugar solution
- B. to hydrolyse the sugar solutionCorrect
- C. to dry the sugar solution
- D. to increase the volume of the sugar solution
Explanation
Dilute hydrochloric acid is added and boiled to hydrolyse the (non-reducing) sugar solution, breaking it down into reducing sugars.
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